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In Warehouse 186
Hardtail (65)
Full-Suspension (131)
29-Inch Wheel (29ers) (122)
650B Wheel (52)
Fat Bikes (25)
Downhill/Freeride (3)
Rigid (36)
Mountain Frames (60)
29-Inch Plus Wheel (17)
27.5-Inch Plus Wheel (50)
26-Inch Wheel (1)
Santa Cruz 96
Ibis 10
$6000 to $100000 62
13-inch 2
13.5-inch 6
13.5-inch (27.5) 1
15.5-inch 27
17.5-inch (29) 1
23-inch (29) 1
Medium/Large 45
X-Large 198
X-Small 102
Santa Cruz Heckler (D AM Kit)
Santa Cruz's Heckler powers up climbs, floats down tricky descents, and loves when the trail gets steep. You get 150mm of proven single pivot travel from Fox's reliable Float air shock. This jack-of-all-trades bike is built strong with attention to detail, not carelessly overbuilt. Its burly gusseted front end handles RockShox' Recon fork admirably. And for rolling up and down hills with ease, a Shimano drivetrain has all the gears you need, Mavic's wheels spin smoothly and Avid's powerful Juicy discs put the clamps on your speed. Plus, Santa Cruz's dialed geometry blurs the line between cross-country action and serious freeride fun.
Trek Marlin Frameset - 2020
Marlin Frameset is a lightweight, versatile mountain bike frame great for building up as a fast cross county race bike or a rugged flatbar commuter. It's made of strong Alpha Silver Aluminum and is quick and capable on pavement, gravel, and singletrack alike. It's right for you if... You're looking for a versatile, wallet-friendly frameset you can build up exactly the way you want. You'll fly through singletrack, tackle rugged, all-terrain commutes, or both, depending on how you spec it. The tech you get A lightweight and sturdy Alpha Silver Aluminum frame, internal routing to protect cables from the elements, mounts for a rear rack and kickstand, and a headset. Designed with Smart Wheel Sizing: smaller frames fit 27.5-inch wheels and larger frames fit 29-inch wheels. The final word It's a light and capable frameset at a great value. You can spec it as a solid cross country mountain bike without breaking the bank, or build up a rugged commuter that easily handles potholes and rough roads. Why you'll love it - All the value, plus all the versatility—it's a totally race-worthy mountain bike, with rear rack mounts if you use it for commuting too - It's really fun to ride, and feels like a much more expensive mountain bike - Internal cable routing extends the life of your cables and adds to the bike's sleek look - Like every model in the Marlin family, it's backed by Trek's lifetime warranty
Trek X-Caliber Frameset - 2019
Full of fast, built to last. Caution: X-Caliber will get you hooked. It packs all of Trek's XC race hardtail experience into a light, fast bike that pairs the right wheel size with each frame size. Nothing beats the efficiency, simplicity, and straight-up fun of an X-Cal hardtail in 29er or 27.5". Great for XC racing, or simply shredding singletrack. - All-new lightweight Alpha Gold Aluminum frame delivers a phenomenal ride quality - Shorter chainstays and Boost141 hub spacing for increased agility and clearance for wider tires - Updated geometry and E2 tapered head tube for more confident handling - Sleek internal routing protects cables and accommodates dropper post upgrades
Trek 820
820 is an excellent entryway to a world of off-road adventures. It's the most affordable mountain bike in our lineup and the ideal choice for beginners who are interested in the MTB life but also want a hybrid bike that's as equally suited to light trails as it is to potholed city streets. It's right for you if... You're ready to try your hand at mountain biking to see if you fall in love, and want a bike you can ride wherever you choose. You plan to ride all types of terrain, from city streets to gravel paths and light singletrack. The tech you get 820 has a strong steel frame, semi-slick tires that roll well on pavement and trails, durable alloy wheels, and a suspension fork that takes the edge off bumps. Plus, it has mounts so you can accessorize with racks, fenders, lights, a fitness tracker, a kickstand, and more! The final word 820 is a great bike for anyone testing the waters of off-road riding. It's versatile, durable, and works well on rough pavement, light trails, or both. Why you'll love it - 820 is a great bike at an even better price, and it lets you explore off-road riding without the giant price tag that comes with higher-end mountain bikes - The high-volume mountain bike tires and suspension fork take the edge off rough roads and trails - Rack, fender, and kickstand mounts make it easy to accessorize, so your mountain bike can double as a rugged commuter
Trek 820 WSD - Women's
820 Women's is an excellent entryway to a world of off-road adventures. It's the most affordable mountain bike in our lineup and the ideal choice for women who are interested in the MTB life but also want a hybrid bike with a confidence-building stepthrough frame and a saddle made specifically for women. It's right for you if... You're ready to try your hand at mountain biking to see if you fall in love, and want a bike you can ride wherever you choose. You plan to ride all types of terrain, from city streets to gravel paths and light singletrack. The tech you get 820 Women's has a steel stepthrough-style frame that's easy to mount and dismount, semi-slick tires that roll well on pavement and trails, durable alloy wheels, a seat made for women, and a suspension fork that takes the edge off bumps. Plus, it has mounts so you can accessorize with racks, fenders, lights, a fitness tracker, a kickstand, and more! The final word 820 Women's is a great bike for women testing the waters of off-road riding. It's versatile, durable, and works well on rough pavement, light trails, or both. Why you'll love it - 820 Women's is a great bike at an even better price, and it lets you explore off-road riding without the giant price tag that comes with higher-end mountain bikes -The high-volume mountain bike tires and suspension fork take the edge off rough roads and trails - The stepthrough-style frame makes it easy to mount and dismount - Rack, fender, and kickstand mounts make it easy to accessorize, so your mountain bike can double as a rugged commuter
Salsa Timberjack 20
Timberjack 20 is one of Salsa's plus-sized 3-inch-tire kids' bikes designed to help turn your child's daydreams into reality. Timberjack 20 will be there on family camp adventures and solo missions in the nearby woods, fostering independence all the way. The 6061-T6 heat-treated aluminum frame, modern-day componentry, and geometry specific to the size of the rider provide a durable platform for any quest. High-volume, 3-inch tires offer flotation, traction, and most importantly, added stability that can help smaller bodies stay upright in loose conditions. The Timberjack's 1 x 8-speed drivetrain gives your youngster the ability to handle hilly jaunts with the simplicity of a single twist shifter. Mounts on the forks allow extra water bottles or light gear with Anything Cages to encourage the sorts of rides that turn young explorers into lifelong ones, a gift of immeasurable value.
Salsa Timberjack Frame
The Salsa Timberjack is a hardtail mountain bike that's equally at home pushing the limits on singletrack or bikepacking to places you've yet to discover. Timberjack features modern trail bike geometry, short chainstays for nimble scrambling, and clearance for either 29-inch or plus-size 27.5-inch tires. Build this lightweight and feisty frame the way you like for the way you ride.
Trek Marlin 4 - 2020
Marlin 4 is the perfect gateway to trail riding. It's ideal for new riders who want a mountain bike with knobby tires that can double as a rugged commuter. Disc brakes, front suspension, 21 speeds, and mounts for a rack, fenders, and kickstand make this versatile ride an excellent entry point for new trail riders and campus commuters alike. It's right for you if... You want an introductory mountain bike at an incredible price, but also want a commuter that's rugged enough to hop curbs on the way to class. Disc brakes, knobby tires, and 21 speeds make Marlin 4 a great choice. The tech you get Marlin 4 has 21 speeds with a wide range of gearing for easy riding on varied terrain. It's modeled after our higher-end mountain bikes and built with a lightweight Alpha Silver Aluminum frame that has internal routing to protect your cables, an integrated kickstand mount, mechanical disc brakes for increased stopping power in any weather conditions, and a suspension fork with 75mm of travel—just enough to absorb the big bumps and keep you cruising. The final word Marlin 4's greatest gift is its versatility. It's built in Trek's mountain bike heritage and totally capable of taking on the trails. But it's an efficient daily rider, too. The rack and fender mounts make it a great choice for commuters who want to get a little rad on the way to class or the grocery store. Why you'll love it - It's a real mountain bike that's also perfectly suited to daily commutes, rides around campus, or just getting from A to B on any surface. - The flat mountain-style handlebar and disc brakes keep you in control, on or off the trail. - Rack and fender mounts make it easy to accessorize, so your mountain bike can double as a rugged commuter. - Internal cable routing makes it easy to spec your bike with upgraded trail tech, like a dropper post. - Like every model in the Marlin family, it's backed by Trek's lifetime warranty.
Timberjack 24 is one of Salsa's plus-sized 3-inch-tire kids' bikes designed to help turn your child's daydreams into reality. Timberjack 24 will be there on family camp adventures and solo missions in the nearby woods, fostering independence all the way. The 6061-T6 heat-treated aluminum frame, modern-day componentry, and geometry specific to the size of the rider provide a durable platform for any quest. High-volume, 3-inch tires offer flotation, traction, and most importantly, added stability that can help smaller bodies stay upright in loose conditions. The Timberjack's 1 x 8-speed drivetrain gives your kid the ability to handle hilly jaunts with the simplicity of a single twist shifter. Mounts on the forks allow extra water bottles or light gear with Anything Cages to encourage the sorts of rides that turn young explorers into lifelong ones, a gift of immeasurable value.
Marlin 5 is a trail-worthy daily rider that's perfectly suited for everyday adventures, on and off the trail. A front suspension fork with 100mm of travel, 21 speeds, and mounts for a rack and kickstand make it an ideal choice for new trail riders or anyone looking for a comfortable, stable commuter with the ruggedness of a real mountain bike. It's right for you if... You're new to the trail and want a serious mountain bike that doubles as a commuter—and you want it all at an exceptional value. The tech you get A lightweight Alpha Silver Aluminum frame, 21 speeds, a wide range of gearing so you never need to pedal too hard or easy on terrain that varies in elevation, hydraulic disc brakes that feel smoother than mechanical disc brakes, and a suspension fork with 100mm of travel—that's the same amount favored by most cross-country racers. The final word Built-in Trek's MTB heritage, and more than capable of taking on trail adventures. But it's also versatile. It's a popular ride on college campuses because the rack and kickstand mounts make it easy to accessorize and haul a load. Why you'll love it - It's a real mountain bike that's also perfectly suited to daily commutes, rides around campus, or just getting from A to B on any surface - Smaller frame sizes (13.5" and 15.5") have short-reach brake levers that make it easier and more comfortable for riders with smaller hands to brake confidently - It has separate brake and shift levers (a feature that's common on more expensive mountain bikes) so you can fine-tune the positioning for comfort - Rack and kickstand mounts make it easy to accessorize, so your mountain bike can double as a rugged commuter - Like every model in the Marlin family, it's backed by Trek's lifetime warranty
Trek Marlin 5 Women's
Marlin 5 Women's is a trail-worthy daily rider that's perfectly suited for everyday adventures, on and off the trail. A front suspension fork, a frame and parts designed specifically for women, 21 speeds, and mounts for a rack and kickstand make it an ideal choice for new trail riders or anyone looking for a comfortable, stable commuter with the ruggedness of a real mountain bike. It's right for you if... You're new to the trail, and you're looking for a great value on a real mountain bike that can double as a commuter. You also side with women who prefer the fit and feel of a bike made specifically for them. The tech you get A lightweight Alpha Silver Aluminum frame with a sloping top tube on smaller sizes for better standover height and more confidence on the trail, touchpoints—like the saddle, bars, and grips—that can provide a better fit to women from the start, 21 speeds, a wide range of gearing for big hills, hydraulic disc brakes that feel smoother than mechanical disc brakes, and a suspension fork with 100mm of travel. The final word A trail-tough mountain bike built specifically for women. It's built in Trek's MTB heritage and more than capable of taking on trail adventures. But it's also versatile. It's a popular ride on college campuses because the rack and kickstand mounts make it easy to accessorize and haul a load. Why you'll love it - It's a real mountain bike that's also perfectly suited to daily commutes, rides around campus, or just getting from A to B on any surface - Smaller frame sizes (X-Small and Small) have short-reach brake levers that make it easier and more comfortable for riders with smaller hands to brake confidently - It has separate brake and shift levers (a feature that's common on more expensive mountain bikes) so you can fine-tune the positioning for comfort - Rack and kickstand mounts make it easy to accessorize, so your mountain bike can double as a rugged commuter
Salsa Timberjack 20 SUS
Timberjack's 20 is Salsa's plus-sized 3-inch-tire kids' mountain bike. It's designed to encourage rides that will make young explorers into lifelong ones. This bike will be there on family camp adventures and solo missions in the nearby woods, fostering independence all the way. Timberjack 20 SUS offers a suspension fork for bump absorption to help young riders build confidence on rough terrain. The rugged, heat-treated frame has excellent durability while 3-inch wide tires help them stay upright with maximum stability and traction.
Marlin 5 is a trail-worthy daily rider that's perfectly suited for everyday adventures, on and off the trail. A front suspension fork with 100mm of travel, 21 speeds, and mounts for a rack and kickstand make it an ideal choice for new trail riders or anyone looking for a comfortable, stable commuter with the ruggedness of a real mountain bike. It's right for you if... You're new to the trail and you're looking for a real mountain bike that doubles as a commuter—and you want it all at an exceptional value. The tech you get A lightweight Alpha Silver Aluminum frame with internal routing to protect your cables and add to the bike's sleek look, 21 speeds, a wide range of gearing so you always have the right gear for your terrain, hydraulic disc brakes that feel smoother than mechanical disc brakes, and a suspension fork with 100mm of travel—that's the same amount favored by most cross country racers. The final word It's built in Trek's MTB heritage, making it more than capable of taking on trail adventures. But it's also versatile, and Marlin 5 is a popular ride on college campuses because the rack and kickstand mounts make it easy to accessorize and haul a load. Why you'll love it - It's a real mountain bike that's also perfectly suited to daily commutes, rides around campus, or just getting from A to B on any surface - Smaller frame sizes (XS and S) have short-reach brake levers that make it easier and more comfortable for riders with smaller hands to brake confidently - It has separate brake and shift levers (a feature that's common on more expensive mountain bikes) so you can fine-tune the positioning for comfort - Rack and kickstand mounts make it easy to accessorize, so your mountain bike can double as a rugged commuter - Like every model in the Marlin family, it's backed by Trek's lifetime warranty
Timberjack's 24 is Salsa's plus-sized 3-inch-tire kids' mountain bike. It's designed to encourage rides that will make young explorers into lifelong ones. This bike will be there on family camp adventures and solo missions in the nearby woods, fostering independence all the way. Timberjack 24 SUS features a Suntour XCM fork with a suspension to help handle the bumps and obstacles of the trail. The bike's 3-inch wide tires provide stability and traction on rough surfaces.
Trek X-Caliber Frame - 2020
Features - It gets you into the world of cross country riding and racing at a great price, and it's a mountain bike that can grow with you as your skills advance - The sleek internal cable routing gives you clean looks, protects your cables, and makes it easy to upgrade to a dropper post for even more capability - The frame is fully compatible with higher-end parts, like race wheels and a dropper post, if you ever find the need to upgrade - Mounts on the frame make it easy to add a rear rack if your XC bike doubles as your daily commuter
Surly Lowside Frameset
Lowside is the bike that gets you across town for a quick rip on singletrack, then over to the bar for a night out. Lowside is like the grownup version of the bike you rode when you were a kid and still had hopes and dreams and some semblance of ambition. It's just as happy riding singletrack as it is parked outside your favorite drinking establishment. Lowside is a singlespeed. Singlespeeding has been a part of Surly's DNA since day one when we launched the 1x1 Rat Ride. After a lot of Homie Fall Fests and more feats of strength than we can recall, we decided to discontinue it a couple years back. Lowside picks up right where the 1x1 left off. Some have dubbed the Lowside the ultimate pub cruiser. - Modern trail standards: dropper post compatibility, 44mm headtube, Gnot-Boost rear spacing, thru-axles - Compatibility with most mountain bike standards makes it the perfect parts bin bike (no rim brakes allowed though) - Clearance for 26 x 3 or 27.5 x 2.8 tires
The Surly Lowside is the bike that gets you across town for a quick rip on singletrack, then over to the bar for a night out. It's the bike you turn to when you're not entirely sure what the night has in store. It's the bike to grab when you want to have just as much fun riding to the trail as you do on the trail, itself. Singlespeeding is an integral part of Surly's DNA, and the Lowside continues the tradition, by taking a simpler approach to trail riding. - 100% Surly 4130 chromoly frame, main triangle is double-butted; 1 1/8" threadless chromoly fork - Singlespeed "specific" (derailleur hanger: yes; Trip Guides: no) - Dropper post routing - Gnot-Boost rear spacing - Front and rear thru-axles - 26 x 3" or 27.5 x 2.8" tire clearance
Radio Asura
The Asura features a lightweight but tough chromoly/steel frame, along with a 100mm travel fork and stacked list of Radio, RST, and Tektro components that make a fun and exciting 26" machine you won't be able to put down. It's ready straight out of the box for dirt, street, skate parks, and pump tracks. - 1020 hi-ten frame - RST DIRT RA suspension fork - RADIO DB32 wheel set - RADIO PRO tubular 3pc crmo crank - TEKTRO ARIES mechanical disc brake
Marlin 6 is a quality introductory cross country mountain bike with front suspension and an upgraded 2x8 drivetrain that's light, simple, and easy to use. It's built in Trek's trail heritage, but also equipped with features like mounts for a rack and kickstand that make it a great choice for daily commuters. It's right for you if... You're testing the waters of off-road riding, and want a real mountain bike at a great value, with a wide range of gears to cover more ground on the road and trail. The tech you get The heart of Marlin 6 is a lightweight Alpha Silver Aluminum frame with internal routing to protect your cables and add to the bike's sleek look. It has an efficient 2x8 drivetrain, hydraulic disc brakes that feel smoother than mechanical disc brakes, and a suspension fork with 100mm of travel and a lockout feature that lets you temporarily lock the suspension for better efficiency while climbing. The final word Performance features like suspension lockout, stronger double-walled rims, and hydraulic disc brakes. It's also equipped with rack and kickstand mounts and a wide range of gears. These design details make it a great choice if your mountain bike doubles as your commuter. Why you'll love it - The 2x drivetrain gives you all the gears you need and none you don't - Smaller frame sizes (XS and S) have short-reach brake levers that make it easier and more comfortable for riders with smaller hands to brake confidently - It has separate brake and shift levers (a feature that's common on more expensive mountain bikes) so you can fine-tune the positioning for comfort - Rack and kickstand mounts make it easy to accessorize, so your mountain bike can double as a rugged commuter - Like every model in the Marlin family, it's backed by Trek's lifetime warranty
Marlin 6 Women's is a quality introductory women's cross country mountain bike with front suspension, parts designed specifically for women, and an upgraded 2x8 drivetrain that's light, simple, and easy to use. It's built in Trek's trail heritage, but also equipped with details like mounts for a rack and kickstand that make it a great choice for daily commuters. It's right for you if... You're testing the waters of off-road riding, and want a real mountain bike at a great value with a wide range of gears to cover more ground on the road and trail. You also side with women who prefer the fit and feel of a bike with touchpoints designed specifically for them. The tech you get A lightweight Alpha Silver Aluminum frame with a sloping top tube on smaller frame sizes (XS and S) for better standover height and more confidence on the trail, plus internal routing to protect your cables and add to the bike's sleek look. It also has Women's Specific Design touchpoints like the saddle, bars, and grips, an efficient 2x8 drivetrain, hydraulic disc brakes that feel smoother than mechanical disc brakes, and a suspension fork with 100mm of travel and a lockout feature that lets you temporarily lock the suspension for better efficiency while climbing. The final word Performance features like suspension lockout, stronger double-walled rims, hydraulic disc brakes, and touchpoints designed for women. It's also equipped with rack and kickstand mounts and a wide range of gears. These design details make it a great choice if your mountain bike doubles as your commuter. Why you'll love it - The 2x drivetrain gives you all the gears you need and none you don't - Smaller frame sizes (XS and S) have short-reach brake levers that make it easier and more comfortable for riders with smaller hands to brake confidently - Marlin Women's models in XS and S frame sizes have a curved top tube and a lower standover height that makes it easier for smaller riders to mount and dismount - Rack and kickstand mounts make it easy to accessorize, so your mountain bike can double as a rugged commuter - Like every model in the Marlin family, it's backed by Trek's lifetime warranty
Surly Troll Frameset
Off-road touring can be a zesty enterprise, but it's not without its perils. Bicycles are simple machines that are extremely efficient, but all simple machines carry along with them the chance of breaking down. This efficiency can get you in trouble if your bike decides to break down far away from the comforts of your parent's basement. If you're going to ride your bicycles where no one can see, you better take gear that's up to the task. Troll is up to the task. Surly's Troll was once a simple mountain bike frame with a few extras that made it nice for touring. The Troll has evolved into a frame that has been pushed deeper into the category of off-road touring. Its geometry is no longer suspension corrected, which gives it more room for a larger frame bag. The chainstay yoke has been redesigned to be fully compatible with 26+ tires and comes with the always-comfy Jones Loop bar. The dropouts still allow you to run disc brakes, fenders, a Rohloff hub, and racks simultaneously. It also comes with more braze-ons than you thought possible – there are four triple bottle mounts on the fork alone (don't get excited, you can only run one Anything Cage per fork leg), as well as two more triple bottle mounts on the down tube. Troll is a bike that has one purpose – and that purpose is to carry you as far away from society as possible.
Surly Ogre Disc Only Frameset
If you're like us, your bike needs will likely change by the day, week, month or year. Ogre will get you to your job during the week, then way out of town on the weekend. It even has the chops to handle a cross-country trek or nine. It's not sluggish on pavement or gravel and can also hold its own on singletrack. Ogre is designed to be the ultimate steel utility vehicle. It relishes in those "take-the-long-way-home-and-find-some-beverages-along-the-way" sort of commutes. You can also haul enough crap on it that you don't even have to go home if you don't want to. For this year, we simplified Ogre a bit. We removed the canti studs, so it is now a disc brake-only beast. Now, before you start yelling at us about how the canti studs were the only reason you were even considering buying an Ogre and now we've left you contemplating your very existence in this ultimately-doomed universe, hear us out. Rim brake 29er rims — like the ones that you would need to have to make use of those canti studs in the first place — are becoming increasingly harder to find. We could have given you a feature that you'd end up not really being able to use in the future but what kind of monsters do you think we are? To quench your unquenchable thirst for rim brakes, check out the Troll. As far as other updates to the frame go, that about sums it up. Ogre still has everything else you've come to know and love: two water bottle mounts, four sets of three-pack bosses, mid- and low-blade fork eyelets, threaded holes for racks, fenders, and trailer mounting nuts, and a Rohloff OEM2 axle plate slot. It still features horizontal-slotted dropouts with Gnot-Boost spacing, a tweaked non-suspension corrected geometry, and a beefy tire clearance. It's still fully compatible with both 29 x 2.5" and 27.5+ tires. In the complete bike version, we've opted to go with a 1x drivetrain and a flat handlebar. We typically try to avoid BS cliché terms like "Do-It-All" or "Swiss Army Knife of Bikes", so we'll just say that Ogre can probably handle most of the ideas that are bouncing around in your head.
Surly Pugsley Frameset
The Surly Pugsley may be the original fat bike, but this one is far from the original. Previously a great all-around fat bike, the Pugsley has been redesigned to be an ideal off-road touring and exploration rig. Surly lengthened the chainstays 12mm for stability when loaded and so your heels float effortlessly past panniers. The tweaked rear rack mounts on the dropouts let you center your rack over the wheel, despite the offset rear triangle. Those dropouts will take a 142 x 12mm thru axle if that's your schtick, but can also be used with 135 x 10mmm QR hubs with Surly's Adapter Washers. Pugsley brings back the 135mm-spaced offset fork, so you can run a front wheel with a spare cog or freewheel as a bail-out option to swap with the rear if your internally-geared hub freezes up in neutral or you smash your derailleur having too much fun. A plethora of three-pack mounts give you gear-hauling options aplenty, so go wild with your build. - 100% Surly 4130 chromoly frame, main triangle is double-butted; 1-1/8" threadless brazed chromoly fork - Four sets of Three-Pack Mounts (two on the fork, two on the downtube), a water bottle mount on the seat tube, and front and rear rack mounts - 142 x 12mm rear dropout (or 135 x 10mm QR with Surly 10/12 Adapter Washers) with Rohloff torque arm slot - 135mm-spaced fork with 17.5mm offset for wheel swappability - 26 x 4.8" tire clearance in frame (with drivetrain restrictions), 26 x 4.3" tire clearance in fork
Off-road touring can be a zesty enterprise, but it's not without its perils. Bicycles are simple machines that are extremely efficient, but all simple machines carry along with them the chance of breaking down. This efficiency can get you in trouble if your bike decides to break down far away from the comforts of your parent's basement. If you're going to ride your bicycles where no one can see, you better take gear that's up to the task. Troll is up to the task. Our Troll was once a simple mountain bike frame with a few extras that made it nice for touring. The Troll has evolved into a frame that has been pushed deeper into the category of off-road touring. Its geometry is no longer suspension corrected, which gives it more room for a larger frame bag. We've also adorned this frame with our Gnot-Boost spacing, allowing you to use any mountain bike hub whether it be 135mm QR, 12 x 142mm thru-axle, or 12 x 148mm Boost hub. The chainstay yoke has been redesigned to be fully compatible with 26+ tires and the dropouts still allow you to run disc brakes, fenders, a Rohloff hub, and racks simultaneously. It also comes with more braze-ons than you thought possible – there are four triple bottle mounts on the fork alone (don't get excited, you can only run one Anything Cage per fork leg), as well as two more triple bottle mounts on the down tube. Troll is a bike that has one purpose – and that purpose is to carry you as far away from society as possible. Man has known for eons the call of the indifferent forest. The inexorable march of time, and dumb crap like cell phones, have dulled our senses and made us afraid. Reclaim your animalistic tendencies atop Man's greatest invention.
Off-road touring can be a zesty enterprise, but it's not without its perils. Bicycles are simple machines that are extremely efficient, but all simple machines carry along with them the chance of breaking down. This efficiency can get you in trouble if your bike decides to break down far away from the comforts of your parent's basement. If you're going to ride your bicycles where no one can see, you better take gear that's up to the task. Troll is up to the task. Surly's Troll was once a simple mountain bike frame with a few extras that made it nice for touring. The Troll has evolved into a frame that has been pushed deeper into the category of off-road touring. Its geometry is no longer suspension corrected, which gives it more room for a larger frame bag. Surly also adorned this frame with their Gnot-Boost spacing, allowing you to use any mountain bike hub whether it be 135mm QR, 12 x 142mm thru-axle, or 12 x 148mm Boost hub. The chainstay yoke has been redesigned to be fully compatible with 26+ tires and the complete bike comes with the always-comfy Surly Moloko Bar. The dropouts still allow you to run disc brakes, fenders, a Rohloff hub, and racks simultaneously. It also comes with more braze-ons than you thought possible – there are four triple bottle mounts on the fork alone (don't get excited, you can only run one Anything Cage per fork leg), as well as two more triple bottle mounts on the downtube. Troll is a bike that has one purpose – and that purpose is to carry you as far away from society as possible. Man has known for eons the call of the indifferent forest. The inexorable march of time, and dumb things like cell phones, have dulled our senses and made us afraid. Reclaim your animalistic tendencies atop Man's greatest invention.
Surly Wednesday Frameset
The Wednesday is Surly's all-terrain fat bike frame. The frame features trail-ready geometry, 4.6-inches of tire clearance, provides lots of cargo carrying capabilities and is suspension corrected for use with a 100mm suspension fork (sold separately). - 100% Surly 4130 CroMoly steel with 44mm headtube and internal dropper post cable routing - Frame is ED Coated for increased life expectancy - 1-1/8" straight steerer fork, 4130 CroMoly - 100mm threaded bottom bracket shell - Universal cast dropouts accommodate thru-axle or quick-release standards
Wednesday is a great all-around fat bike that has the soul of a trail bike and mind of a touring bike Wednesday sits in the middle of our Trail category, but don't let that fool you into thinking that's its only use. With Wednesday, we borrowed elements from some of our Trail and Touring models to create a versatile fat bike that can truly handle anything you want to attempt. If you do an equal amount of off-road touring as you do hitting trails, Wednesday's ability to play both parts equally will suit you well. Or, if you're looking for a fat bike and don't need the fattest tires on the market, Wednesday's 26 x 4.6" tire clearance is just the ticket. Any day of the week's a great day to ride a Wednesday. - Modern mountain standards: stealth dropper post routing, 44mm headtube, suspension correction, front and rear thru-axles - Full suite of useful braze-ons: front and rear racks, multiple sets of three-pack mounts, fenders - Full-forward, short chainstay position: 26 x 3.8 tires on 80mm rims; full-rearward, longer chainstay position: 26 x 4.6 tires on an 80mm rim
Surly Karate Monkey Frameset
Karate Monkey is a highly-versatile trail bike that plays the part of 29er and 27.5+ equally well. Multipurpose Hardtail Mountain Bike Karate Monkey delivers a resilient, lively ride on all sorts of gnarly terrain. Its frame is a highly-versatile canvas for whatever dirty masterpiece your brain cooks up. According to our computing machine (Thor) it can be set up in approximately 487 different configurations. Originally designed as a 29er (and the frame that helped spark the 29" wheel movement), the latest Karate Monkey is designed to perform just as admirably as a 27.5+ rig as well. This allows you to pick your poison — provided your poison is having a really great time while permanently donning a maniacal grin, of course. - Modern trail standards: dropper post compatibility, 44mm headtube, Gnot-Boost rear spacing, thru-axles, suspension-corrected fork - Compatibility with most mountain bike standards makes it the perfect parts bin bike (no rim brakes allowed, though) - Clearance for 29 x 2.5 or 27.5 x 3 tires
The Karate Monkey frame features updated, progressive trail geometry, a new tubeset, and Surly's Gnot-Boost rear dropout system to support multiple drivetrain and wheel size configurations. - 100% Surly 4130 chromoly steel frame and fork; double-butted main triangle and 44mm headtube - Tubeset uses the same trumpet tubes found on Instigator 2.0 frame - Adjustable rear dropouts with 145mm Gnot-Boost spacing works with 142 x 12, 148 x 12mm, and 135mm w/ 10/12 washer - Internal dropper seatpost routing - 30.9mm seat tube ID - Clearance for 29 x 2.55 or 27.5 x 3 tires
Surly Krampus Frameset
Krampus is a dedicated 29+ trail bike that can go over, off of, or through just about anything in its path. Breaking the Mold with a 29er Bike As the first "plus" bike to hit the market, Krampus changed the way many people approach trail riding. It's shown people the light of how high-volume, large-diameter tires can vastly improve the ride experience. It's also done a bang-up job dispelling the myth that big tires make you slow. Krampus is kind of like the opposite of a mullet: long in the front and short in the rear. With a long toptube and compact chainstays, it takes trail-shredding abilities to the next level. A mullet may be business in the front, party in the back but Krampus makes partying its business. "Lean back, hang on, and ride that wild horse." -Thor - Modern trail standards: dropper post compatibility, 44mm headtube, Gnot-Boost rear spacing, thru-axles, suspension corrected fork - Compatibility with most mountain bike standards makes it the perfect parts bin bike (no rim brakes allowed, though) - Clearance for 29 x 3" tires


During the show's premiere episode last week, Val Lehman looking in Nigel Married male fun at her ex-husband Charles Collins when looking in Nigel Married male said to the camera: She was five years older than me and funny and warm. I was shocked to see these walls, it's a new apartheidbarbaric behaviour: In his account, Miss Potter was a phenomenal cook in a way his mother never was. He describes in his autobiography wrangling a herd of cattle and catching sight in the distance of a figure who turned out to be Williams. Yes, she may have been mad, as she later said, but it was a magnificent folly. Personal life[. It was locked away in a leather bag, hidden from view- he had to cut away the lock in order to get to it.


Title Facilities planning for health, fitness, physical activity, recreation and sports : concepts and applications / Thomas H. Sawyer, editor-in-chief.
Imprint [S.l.] : Sagamore, c2002.
Description viii, 500 p. : ill. ; 31 cm.
Bibliography Includes bibliographical references (p. -494) and index.
Subject Sports facilities -- Planning.
Added Author Sawyer, Thomas H.
American Association for Active Lifestyles and Fitness.


The University of California recently awarded UC San Diego entrepreneur Jason McKeown for his wearable weight loss technology company Neurovalens, UC announced Monday.
McKeown was one of 12 finalists in the third annual UC Entrepreneur Pitch Competition. Six early-stage biotechnology startups and six late-stage biotech businesses were selected to present their pitches at last week's 2019 Global Corporate Venturing and Innovation Summit. According to UC officials, nearly 150 businesses and startups from all 10 UC campuses applied to the pitch competition.
McKeown won in the late-stage category for Neurovalens and its signature product, Modius, a headset that sends electrical pulses into the wearer's brain to curb appetite and cravings.
Digital clinical diagnostics startup Velox Biosystems, started by UC Berkeley's Byron Shen, won among early-stage entrants. The 12 finalists included three other UCSD startups as well as products from UC Berkeley, UC Davis and UC Irvine.
According to Christine Gulbranson, UC's senior vice president for innovation and entrepreneurship, the number of applicants spurred UC officials to create two categories for this year's awards.
The 12 finalists presented their startups to a panel of investors and an audience surpassing 800 people at the summit. McKeown and Shen each received a $15,000 prize for winning in their respective categories.


text:
Uber Has Unveiled A New Logo And The Reaction To It Has Been Rather Cold
February 3, 2016 February 3, 2016 OfficeChai Team
When you hurriedly book your ride to or from work today on your Uber app, there's a small detail that you may or may not miss.
Uber, first time in its 6 year run time, has rolled out a new logo and a new branding. The black and white upturned U against a black background, has been replaced with a blue square with many graphic elements and patterns in it. The new logo reflects the individuality of Uber's local markets and has been personally looked after by CEO Travis Kalanick and designed by inhouse art director Shalin Amin.
The colour and pattern of the logo will differ in each country, portraying its unique character and culture. The Indian logo is inspired by its colours and architectural nuances.
Explaining the new branding, Uber on its blog said.
Uber began life as a black car service for 100 friends in San Francisco—everyone's private driver. Today, we're a transportation network spanning 400 cities in 68 countries that delivers food and packages, as well as people, all at the push of a button. And thanks to services like uberX and uberPOOL we've gone from a luxury, to an affordable luxury, to an everyday transportation option for millions of people….We are not just technology but technology that moves cities and their citizens.So today, we're excited to roll out a new look and feel that celebrates our technology, as well as the cities we serve.
Within hours of the new logo, reactions have been pouring in all over social media. While a few appreciate the change, most reactions have been rather cold.
Many people in India have likened the logo to the SBI logo.
New Uber Logo looks like State Bank of India logo, flipped pic.twitter.com/3uwVtSLxMV
— Naren Balaji (@narenbalaji) February 3, 2016
While globally the logo has also met with some disapprovals.
Dear Uber: your old logo was very bad but useful. Your new logo is very bad and useless. Yours truly, Everyone. pic.twitter.com/uWHgJcSbm4
— Joshua Topolsky (@joshuatopolsky) February 3, 2016
The resistance to acceptance of the change from a brand as prominent as Uber, which has come to be an everyday part of people's lives is expected. Whether or not, the logo change really affects Uber's mission to be everyone's personal driver and transform the Commutech industry is anyone's guess.
Posted in News, StartupsTagged uber

redpajama_set_name: RedPajamaCommonCrawl


An 83-year-old man was hit by a car while crossing the street in Christiansburg on Wednesday morning.
It happened just before 6 a.m. on Route 460 Business near Walmart.
Police say Anthony I. Antonio Jr., a Christiansburg resident, was walking across the street when he was hit by a 2018 Nissan that was traveling southbound. The driver stopped at the scene and called 911.
Antonio was taken to LewisGale Hospital Montgomery and later airlifted to Carilion Roanoke Memorial Hospital with life-threatening injuries.
The driver has not been charged at this time.


An eight year Army & National Guard veteran, Debra, has been unemployed since 2010. She possesses unique skills and qualifications as a Battalion Retention Manager, Brigade Food Service Adviser/Business Owner and a Sexual Assault Response Coordinator.
In May 2014, Ms. Mendez attended our monthly Veteran's Job Club session located at the Randallstown office, Baltimore County Workforce Development Center on the campus of CCBC. While there she established a strong connection with DVOP Fuller and Ms. Mendez was inspired to come into the Eastpoint Workforce Development Center. While there she was able to get one-on-one vocational guidance counseling. This involved restructuring her resume, utilizing effective techniques to incorporate the best words for her resume, and help with tailoring her cover letters to fit specific jobs.
As a result of her determination, participating in the monthly Veterans Job Club, and initiating assistance of the DVOP's at the various locations in the Baltimore area Debra secured full-time employment with Unidine (St. Martin's Home) as a Cook Supervision. Debra is also a graduate student in the Master's Program at Walden University as of June 2nd 2014 with a strong interest or emphasis in Mental Health Counseling & Sexual Assault Advocacy& Awareness.


Currently, job seekers have a vast array of options for seeking employment. Sites such as LinkedIn, Monster, Indeed, Craigslist, and Hired are a few companies that have online platforms where job candidates can browse through and apply to relevant job listings. Similarly, these sites can also help company recruiters post listings allowing them to find suitable candidates.
However, though there are available options for career building, the overall efficiency of any hiring process has seen a sharp decline over the years. According to Glassdoor, the average interview process length in the U.S. is now 22.9 days versus 12.6 days in 2010. How can we create better connections between job seekers and recruiters to improve the efficiency of job application processes?
My solution to this issue is inTrak, a new career management product that would be developed by LinkedIn and hosted within LinkedIn's platform. Accessible through LinkedIn's Premium Service, inTrak would allow job seekers to track, manage, and organize their job applications on LinkedIn as well as communicate more efficiently with recruiters. Similarly with inTrak, job recruiters could better organize their job postings and manage potential candidates more proficiently.
How will inTrak bring value to its customers? To answer the question, I summarized each aspect of the product and company (LinkedIn) within a business model canvas. The main takeaways from here are the Customer Segments and Value Proposition; essentially who are the users and why would they use inTrak?
1. Job Seekers - People who are actively seeking new jobs online, whether it be on LinkedIn or other career sites such as Monster or Hired.
2. Company Recruiters - People working as recruiters for companies who are actively posting job listings and/or communicating with potential candidates on LinkedIn or other career sites.
To understand who I am building this product for, I created a user persona of the possible average user of inTrak. The persona helps to create empathy and allows me to understand what kind of product the average user is looking for.
Candidate Dashboard - Candidates can view the job listing(s) they applied to, track any updates or outstanding tasks required on their applications, view key metrics on their performance between all applications, and see whether or not they have any LinkedIn connections within the companies they are applying to.
Popup Screens - Candidates/Recruiters can view different sections of their dashboard via popup screens such as searching for similar jobs in the area.
Video Conference - A key feature of InTrak is the ability to hold video interviews hosted by LinkedIn. Companies no longer have to maintain their own video interviewing platforms.
Recruiter Dashboard - Recruiters can edit the job listing they posted, view LinkedIn profiles for which candidates have applied to the position, and view key metrics in regards to their hiring goals.
I created a high level product roadmap to help the product team understand the projected timeline of inTrak, from ideation to release.
I wanted to focus an extensive amount of time on both the security and customer outreach aspect of the product.
One issue companies may have with hosting their job application processes on the inTrak platform is allowing LinkedIn as an organization have ownership of their data. Strong security measures would allow companies to feel more safe with hosting crucial application information via inTrak.
Additionally, I wanted to focus on bringing LinkedIn's existing clients onboard to use this new premium service. Early adopters would help pave the way to understand what new features to work on and what issues to fix.


text:
Q: What is the meaning of event_params value for firebase conversion? I am researching about firebase conversion in BigQuery and right now still not understanding at all about conversion meaning
I tried this query to check out the value of the 'firebase_conversion' key and see that all of the value is 1.
Is this value mean that the event is marked conversion in Firebase?
SELECT event_name, event_params.value.int_value  FROM [firebase-public-project:analytics_153293282.events_20181003] where event_params.key = "firebase_conversion"

Is there anyone familiar with conversion?
Could you guys help me to explain how firebase calculate the conversion rate? and How could we calculate it through BigQuery

A: On top of the documentation rtenha mentioned, you can also find a specific Firebase in BigQuery section in [1]. It even has some SQL examples regarding Firebase data exploration with BigQuery.
As you say, the value of 1 in event.params.value.int_value indicates that it is marked as a conversion, and it might be useful when it comes to counting events of that type.
In order to calculate the conversion rate, you need to divide the number of USERS that have done some type of conversion among the total number of USERS.
Here is an SQL example [2] that would:
1-create a table with an only cell: the total number of users in the desired time
2-create a table with the number of users that performed each of the events marked as conversions
3-select, for each type of event, the ratio of users that performed such conversion and the total number of users
I hope this finds you well!
[1] https://support.google.com/firebase/answer/9037342?hl=en&ref_topic=7029512
[2]
WITH t_e as (select count(DISTINCT user_id) as total_events from table_of_events
WHERE
table_of_events.event_timestamp >
      UNIX_MICROS(TIMESTAMP_SUB(CURRENT_TIMESTAMP(), INTERVAL 10 DAY))
AND table_of_events._TABLE_SUFFIX BETWEEN '20180501' AND '20180511'),

t_c as (SELECT count(DISTINCT user_id) as total_conversions from table_of_events
WHERE
table_of_events.event.params.key = "firebase_conversion",
table_of_events.event_timestamp >
      UNIX_MICROS(TIMESTAMP_SUB(CURRENT_TIMESTAMP(), INTERVAL 10 DAY))
AND table_of_events._TABLE_SUFFIX BETWEEN '20180501' AND '20180511'
GROUP BY event_name)

select event_name, t_c.total_conversions/t_e.total_events as conversion_rate

FROM t_c, t_e

redpajama_set_name: RedPajamaStackExchange


text:
Q: Silverlight relativebinding ItemTemplate ListboxItem - Listbox I created programatically a class (I called it ViewGrid) so that I use an instance of it as ItemTemplate for my ListBox control; of course, it's my data template for the listboxitem....
Also, in my ViewGrid class, I got a dependency property called IsChecked and I want to keep it in sync with the ListBoxItem's IsSelected property. I noticed that in SL there no relativesource-findancestor-ancestortype support for binding as in WPF, still, I need to find a way to keep my IsChecked property synchronized with the IsSelected property of the internally generated ListBoxItem for my ListBox control. Can you help?

A: Here is a ListBox defined in XAML that uses the IsSelected property of each LitBoxItem to show or hide a button when selected.  You just need to duplicate that Binding approach for the ListBoxItems you create in code.  Either that, or create a UserControl with the appropriate ListBoxItem XAML, and insert instances of those UserControls into your ListBox.
<ListBox>
    <ListBox.ItemTemplate>
        <DataTemplate>
            <Grid Width="200" Height="120">
                <StackPanel Margin="5">
                    <TextBlock Text="{Binding Name, Mode=OneWay}" />
                    <StackPanel Visibility="{Binding IsSelected, Mode=OneWay, Converter={StaticResource BoolToVisible}}">
                        <Button Content="Show Details" Click="OnDetailsClick" Tag="{Binding}" />
                    </StackPanel>
                </StackPanel>
            </Grid>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

Good luck,
Jim McCurdy
Face To Face Software and YinYangMoney

A: UPDATE: I revisited this and found a much better solution. My original one remains below, but the way I actually ended up solving this problem is via using the ViewGrid in a ControlTemplate instead of a DataTemplate. Then you can use the RelativeSource TemplatedParent binding to bind to the IsSelected property of the ListBox. So, add the following to the Resources of the listbox or your page or user control:
<Style TargetType="ListBoxItem">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="ListBoxItem">
                <StackPanel>
                    <ViewGrid IsChecked="{Binding IsSelected, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay}"/>
                    <!-- other controls may go here -->
                </StackPanel>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

ORIGINAL:
So after seven years, you almost certainly don't need an answer to this anymore... however, I recently spent a morning wrestling with this issue and thought I'd give my solution in case any similar unfortunate ends up here.
First off, anyone who's using Silverlight 5 is in luck as AncestorType is apparently now available for RelativeSource, letting you bind directly to the IsSelected property of the ListBoxItem. For those of us stuck with 4 or below, the only real workaround I came up with was "faking" the binding via use of events in the code behind.
To do this, assume you have your YourView XAML with a ListBox named "lbYourListBox" which has its ItemsSource and SelectedItem properties bound to appropriate properties on a YourViewModel class, along with a ViewGrid in its ItemTemplate whose IsChecked property is not bound to anything. Then, in your code behind file, you wire up events as follows:
public YourView()
    {
        InitializeComponent();
        this.Loaded += (sender, e) =>
        {
            ((YourViewModel)this.DataContext).PropertyChanged += vm_PropertyChanged;
            UpdateViewGrids();
        };

    }

    // this part propagates changes from the view to the view model
    private void viewGrid_Checked(object sender, RoutedEventArgs e)
    {
        var selectedVM = ((ViewGrid)sender).DataContext as SourceItemType;
        ((YourViewModel)this.DataContext).SelectedViewGridItem = selectedVM;
    }

    private void vm_PropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        if (string.Equals(e.PropertyName, "SelectedViewGridItem"))
        {
            UpdateViewGrids();
        }
    }

    // this part propagates changes from the view model to the view
    private void UpdateViewGrids()
    {
        var viewGrids = this.lbYourListBox.GetVisualDescendants().OfType<ViewGrid>();
        var selectedVM = ((YourViewModel)this.DataContext).SelectedViewGridItem;
        foreach (var grid in viewGrids)
        {
            grid.IsChecked = selectedVM == grid.DataContext;
        }
    }

The viewGrid_Checked event handler should be wired up to the Checked event of the view grid in the ItemTemplate. The GetVisualDescendants() method comes from the Silverlight Toolkit.
Important caveats:

*

*The ViewGrid.Checked event should not fire except for the unchecked->checked transition, and no more than one view grid should be able to be selected at once. If those two things aren't true, you'll have to make appropriate edits to ensure this code can't cause an infinite event-driven loop. (Of course, if you don't need two-way binding, you only need one of these event handlers and event ping-pong isn't a concern.)

*I wrote this for a user control which had its data context set in XAML, which is why the event handler for the view model's PropertyChanged event is only assigned after the view is loaded. Depending on how and when your view and view model are bound to each other, you may have to assign that earlier/later/differently.

*This won't work if the view grids aren't visible, GetVisualDescendants seems to ignore hidden/collapsed controls.


text:
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Home News & Analysis Africa Ethiopia Launches Its Own Space Program
Ethiopia Launches Its Own Space Program
Kevin Virgil
Aerial view of the city of Addis Ababa during sunset
Ethiopia achieved a milestone on 26 August when the country announced the formal launch of its own space program initiative. Billed as the first such program in East Africa, and the third on the continent (South Africa and Nigeria already have similar efforts underway), the program 'launched' with the opening of its observatory atop 3,200-meter Mount Entoto.
Predictably, the program has faced both internal and external criticism from professional aid providers and government bureaucrats, who cite the country's entrenched poverty and malnutrition as more important priorities. But Solomon Belay, the new observatory's director and long-time defender, believes that the program can act as a developmental asset by promoting engineering and sciences domestically, and by creating jobs.
The tipping point came when the program received financial backing and support from Ethiopian-Saudi billionaire Mohammed Alamoudi, Ethiopia's richest man. Now the government is fully on board, with plans to build a new and more powerful observatory on a mountain far removed from the bright lights of Addis Ababa. Plans are also in the works to launch a national satellite within five years, which can be used to monitor agricultural development and create a national communications network.
Mohammed Alamoudi
Solomon Belay
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Three Dangerous Assumptions In the Post-COVID World


Corio Bay Camera Club provides a friendly atmosphere where members and visitors can socialise and improve their photographic skills. We encourage membership from all age groups and skill levels. Experienced members actively assist newcomers.
The club was formed in June 1954 as the Ford Camera Club by a group of Ford employees and has been a member of the Victorian Association of Photographic Societies since 1956.
We have been known as the "Corio Bay Camera Club" since September 1, 1977 and became an Incorporated Association in April 1985.
Visitors and prospective members are always welcome to come along to our meetings which are held at 7.30pm on the 1st, 2nd, 4th & 5th Thursdays of the month. Our rooms are located at Osborne House, North Geelong, However Due to work being currently being carried out at Osborne House, we are meeting on a temporary basis at Centenary Hall, Cox Road, Norlane until further notice.
For more detailed information about the club's activities go to our What's On page.
Special Interest groups also meet at other times. Contact Us for more details.
The annual adult membership fee is $50 (Concession $40, Primary/Secondary Student $10).


text:
Q: Does ferrous/non-ferrous matter for ground planes? I'm wondering about the best materials for making a ground plane. I've found some websites that claim that non-ferrous materials (i.e. aluminum) are generally poor ground planes (or at least not as good as the same size of a ferrous ground plane). Other sources claim this is a myth.
Does having a ferrous material for a ground plane matter? If so, why does it matter?

A: Both your provided links sound like they were written by someone with very little understanding of how antennas work. I would ignore them entirely.
A ground plane is a necessary part of a monopole antenna, often called a "vertical" since that's how they are usually mounted. These antennas are essentially half a dipole, with the other half being the electrical "mirror" of the antenna on the other side of the ground plane.
The only requirement for the ground plane is that it conducts. The more conductive it is, the better. The bigger it is, the better. Professional AM radio broadcast antennas use lengths of copper wires buried just under the ground, radiating out from the base of the antenna, to make the Earth more like an ideal ground plane. I'm sure if iron worked better, they'd use iron, as it's much cheaper than copper.
If I had to guess, the reason CB operators think ferrous metals make better ground planes are two-fold:

*

*they have no clue about how antennas work

*magnet-mount antennas, very popular for CB, won't stick to non-ferrous metals (though other than not sticking, they work fine)

If you don't actually have an antenna, then none of this applies. The lesson to be learned is this:
Don't use references written by CB operators as a source for learning about electrical engineering of any sort.


We understand why local cafés have water bowls for dogs on the sidewalk, but we were a bit perplexed to see a bowl outside a local realtor on Santa Cruz Ave.
On the one hand, the colorful paw motif suggests the bowl came from Pet Place, just up the block, so kudos for shopping locally. On the other hand we are curious why dogs would be visiting a realtor. Do prospective buyers bring their pets to look over listings, to get a second opinion as it were? Could it be that some Menlo pets are so wealthy that they can afford their own place?
It may just be that some kind soul is conscious of the fairly steady stream of Menlo canines that daily promenade on Santa Cruz, and has taken pains to see that they don't go thirsty. But you never know – there could be a beagle in town who had early options at Google and is now looking to upgrade from doghouse to townhouse.
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