All Bikes & Gear

Specialized's Air Tool Sport Floor Pump boasts all-steel construction, durable internals, a long hose, a sturdy handle and a three-sided base for easy pumping and excellent stability. You also get Specialized's SwitchHitter head that automatically adapts to fit Presta and Schrader valves, and an easy-to-read, 2-inch gauge to make dialing in the right pressure a breeze.

Flat-less – With a purposeful trekking tread A heavy-duty trekking tread for asphalt, or off-road allows this versatile tire to always feel at home, whether in everyday use, or on long tours. The robust structure is an effective damage defense that is twinned with SmartGuard, the most effective puncture protection belt for bicycle tires. - Wire Bead - Black with Reflective Sidewall

The Baja Trike is fashioned after Sun's wildly successful Baja Cruz, a two-wheeled model that first introduced the cycling world to wide-tired beach cruising. Now that same great experience can be had on three wheels! The Baja Trike gives you stability and comfort like never before. Fully featured, it comes with easy twist-shift gearing for hills and smooth, powerful disc brakes front and rear. With both fun and understated color options, the glossy frame and matching painted chain guard adds a touch of class and the high handlebars put you in control. Consider this the SUV of Sun's lineup, it puts in work and it still brings the party wherever it goes. - High-tensile steel easy step-through frame with direct mount rear derailleur and disc brakes - 7-speed SunRace gearing - Front and rear disc brake with brake lever actuated parking locks - Alloy extra-wide rims with stainless steel spokes - 24 x 3.50" Sand Storm street tires - Sun Trike high rise steel handlebar - Sun Trike deluxe saddle with double coil spring suspension - Steel chain guard - Custom tubular alloy rear basket with wood insert, 20"x15"x10"

You bought a Thule Podium Rack and now you need to match the feet to the roof of your car; don't sweat it. The Thule Podium Fit Kit arms you with the four pebax-coated, car-specific brackets and custom-fitted, rubberized footpads you need to mate the feet

Premium features, certified protection, and sleek styling make the Chamonix a tremendous value for any cyclist. You'll also find that it's equipped with next-level protection courtesy of revolutionary MIPS technology (Multi-Directional Impact Protection System). - One-size system, designed for an easy and accurate fit to a wide range of head sizes - Headset SX fit system with micro-adjustable dial for an easy, secure, and accurate fit - 4th Dimension Cooling System optimizes ventilation - In-molded shell improves strength and reduces weight - Tri-Fix web splitter for improved comfort and ease of strap adjustments - Reflective webbing and decals for increased visibility to motorists in low-light conditions - Patented clip-on visor included - MIPS-equipped - Fit system is ANGi crash sensor ready

Born in the American Midwest, gravel riding is one of the fastest–growing styles of cycling. The sense of adventure, conquering new challenges, and simply experiencing a new style of riding are some of its big selling points, but doing so without the proper tires makes the difference between having fun and cursing and hollering on the side of the road. The Pathfinder delivers the versatility that these adventure-laden rides deserve—fast rolling, lots of grip, and a whole lot of fun. - Casing: 120 TPI - Bead: Foldable - Butyl wrapped bead = 2Bliss Ready - Compound: GRIPTON - Flat Protection: Endurant Casing and BlackBelt - 650b x 47mm [1.75"], psi 35-65, approximate weight 555g - 700 x 38mm, psi 50-80, approximate weight 480g - 700 x 42mm, psi 50-80, approximate weight 540g - 700 x 32mm, psi 50-80, approximate weight 380g

Specialized's ultra-light Power Expert saddle is Body Geometry designed for both men and women to have top performance in a more aggressive position. Proven through blood-flow testing and pressure mapping, the extra-wide and elongated Body Geometry channel and proper sitbone support allows for all day comfort. - Patented Body Geometry design is lab tested for both men and women to assure blood flow to sensitive arteries - Stiff, carbon-reinforced shell for longevity and all-day riding efficiency - Lightweight and supportive PU padding for comfort and support on longer rides - Lightweight and durable hollow titanium rails - Tough, light and water-resistant cover - Level 2 padding: Medium density foam; bike feel with additional cushioning - SWAT compatible mounts co-molded into the saddle base allow for sleek and integrated storage solutions - Size 130mm / Weight 230g - Size 143mm / Weight 233g - Size 155mm / Weight 235g - Size 168mm / Weight 238g

- AXS enabled for easy monitoring and firmware upgrades - Bluetooth Low Energy and ANT+ compatible - Power readings are accurate within +/-1.5% and aren't affected by climate conditions during a ride - Power balance measures left and right legs separately - Uses a common CR2032 battery that last for 200 riding hours and changes without tools - Power-upgrade compatible with the following RED and Force eTap AXS cranksets: RED 1x: 36T-46T, Force 1x: 36T-46T, Force 2x: 33/46, 35/48 - Bolt Circle Diameter (BCD): 107 BCD - Power Meter Type: ANT USB

From loose snow to icy freeze-thaw and everything in between, Wrathchild craves the best and worst winter conditions. Deep center lugs aggressively claw into unconsolidated snow for extreme acceleration and braking traction. Super tall side lugs dig into loose snow to provide predictable and confident cornering. Encounter sheer ice on your ride and Wrathchild’s concave studs tear into the surface. - Deep, aggressive lugs dig into snow - Tall side lugs provide cornering confidence - 252 concave studs tear into slick surfaces - Tubeless ready - We design 45NRTH tires for extreme winter cycling applications. We do not recommend this product be used with power assist bikes as the additional torque and system weight can lead to pre-mature casing wear and stud loss

If riding a regular recumbent is easy and comfortable, then riding a recumbent trike is even better. With the EZ-Tri Classic recumbent trike, the rider gets the comfort and mechanical pedaling advantage along with the stability and confidence a trike brings. Try the EZ-Tri Classic for yourself and discover the wonderful world of recumbent trikes. - Fits riders with an X-Seam of 32 – 48"

Forget heavy cruiser tandems. We made our own with lightweight aluminum frames and chromoly forks. A clean fusion of Electra’s men’s and ladies’ patented Flat Foot Technology cruiser geometry into one seamless bicycle built-for-two. Crafted with modern components including smooth-braking front and rear roller brakes.

The Vale Go! 9D EQ will comfortably handle anything from everyday errands to daily commutes to fun getaways. This e-bike features a powerful Bosch Active Line Plus motor, fully integrated battery and a step-thru frame. Bosch's Kiox display delivers Bluetooth connectivity and advanced rider information. Most importantly it's an Electra, so it's a blast to ride. It's right for you if... You are looking for a versatile and stylish pedal-assist e-bike. Equipped with fenders to keep you dry and LED lights to keep you safe, the Vale Go! 9D EQ is ready for your everyday adventures. The integrated MIK rear rack increases functionality allowing you to add panniers and a basket, crate or pet carrier on the fly. The tech you get Powered by a Bosch Active Line Plus motor and outfitted with Bontrager E6 Hard-Case Lite 27.5" tires, hydraulic disc brakes and suspension seatpost, this bike is sure to give you a smooth ride on any terrain. The Bosch Kiox display delivers data on speed, performance, battery charge and more, while adapting to lighting conditions for readability. The final word Go! explore the city. Go! to work. Go! for a weekend cruise. The Vale Go! 9D EQ delivers the best in e-bike innovation combined with the comfort and control of our patented Flat Foot Technology. Get to your destination and beyond, but do it in style. Why you'll love it: - The Vale Go! 9D EQ features our patented Flat Foot Technology and Bosch Active Line Plus motor for optimal comfort and control. - Easily monitor rider data such as speed, battery charge and turn-by-turn navigation in one place with the hi-resolution Bosch Kiox color display. - The step-thru frame provides easy on and off maneuverability. - Equipped with color-matched fenders and LED lights, this e-bike is ready for all conditions. - Turn your e-bike into a me-bike by adding a basket, bell or helmet. The e-ssentials, of course.

What happened when we brought our perfectly balanced Super Light system to our popular Turbo Como E-bike? The best combination of power, range, usability, and comfort in a bike that weighs 40% less than the average e-bike. The Turbo Como Super Light (SL) is designed for running around town. Able to carry twice its weight in cargo, it's a surprising errand bike that's as exciting to ride as it is easy to own. Riders will love the low-maintenance easy ownership that comes with our first Internal Gear Hub E-bike. IGH protects your bike's working gears from the weather and road grime, extending their life up to four times that of a derailleur/chain drive. And you can shift gears anytime, yes, even when stopped–take that traffic lights. The Turbo Como Super Light's sophisticated design is ready to go whenever you are–day and night, rain or shine–with battery-powered integrated lights, fenders, and plenty of storage capability. The 320Wh battery is securely hidden in the downtube, making it almost indistinguishable from a regular bike at first glance. But on days when you want to do more, attach the optional Range Extender to go up to 120 miles before needing a recharge. Trust us when we say, you'll find yourself making up errands just so you can ride it again - 5-speed Nexus Internal Gear Hub and chain drive for shifting when stopped, extended bike performance, and reduced at-home bike maintenance. - Fully integrated Specialized 320Wh downtube battery w/optional Range Extender for up to 120 miles of range. - Specialized SL 1.1 custom lightweight motor, peak 240W /35Nm, 2x you rider amplification (180% assistance), assist up to 28mph. - Bright, integrated front and rear lighting to see and be seen. - Integrated front rack with a basket and top net. - Turbo Super Light mounted pannier-compatible rear rack and DRYTECH fenders. - Aftermarket Turbo Connect Display compatibility. - Clean internal cable routing, fender/rack mounts, and reflective graphics. - TRP Flow Set hydraulic disc brakes for maximum stopping power. - Durable 650b wheels paired with Nimbus 2.3 tires smooth out rough roads, while providing BlackBelt flat protection and reflective accents to increase visibility.

Easy-to-install foot for Thule Edge roof racks, for vehicles with raised railings. - Easy-to-install roof rack feet - For vehicles with raised railings - For Thule Edge roof rack systems - For raised railings Features: - Load carrier feet for Thule Edge roof rack system - Foot installs easily onto vehicles with raised railings - Ergonomic torque limiter key indicates when the rack is safely and properly secured to your vehicle - Rubber lining protects the surface of the raised railings - Secures to vehicle with Thule One-Key locks (sold separately) - Check the Thule Buyer's Guide to find out which roof rack fits your car

The Super Patch Kit is comprised of a small plastic case, a piece of sandpaper for roughing up the tube and 6 peel-and-stick patches so no gluing is required. The patches stick fast thanks to 3M technology and they're thin and flexy to stretch with the tube. There's no easier way to patch a tube.

Topeak's Road Morph G is the perfect answer for riders who've had trouble deciding if they want a frame or floor pump. The Road Morph is both! For maximum pumping power, it features a high-volume aluminum barrel, a fold-out base, a long hose with built-in gauge and a T-handle. Of course, it fits Presta and Schrader valves and a frame mount is included, too.

Completely renewed, sporting a dynamic tread pattern design. Matches with a race bike, as well as a classic city road bike. Available in a wide range of dimensions and colors. PureGrip Compound Based on activated silica compounds, this technology was originally intended as an performance level compound, but after intensive development at our Korbach Research and Development Department Facility, an advanced new compound with outstanding grip and cross-country properties was developed. This new rubber mix, given the self explanatory name "PureGrip", is ranked just behind our BlackChili Compound and is being used in our performance products both in the road and mountain bike sectors. Whilst providing great grip, it is also long lasting and highly durable – both characteristics of Continental tires, which are exclusively manufactured in the factory in Hefei (Asia). Suitable for E-Bikes For our E-Bike tyre we fall back on over 100 years' experience with moped and motorcycle tires. All of our city/trekking tires are rated to a standard speed of at least 25 km/h. Those tires marked e50 are also certified for S-Pedelecs. With their high quality structure, puncture protection is high and the rolling resistance is low offering protection from premature wear brought about by the additional driving force.

The Hardrock'R is a long lasting tire with an aggressive, yet smooth rolling, tread with multi-directional knobs that are sure to improve traction and cornering over mixed terrain. And with the added benefit of Flak Jacket flat protection, you'll be sure to hit it all with confidence and control. - Casing: 30 TPI - Bead: Wire - Compound: 70a - Flat Protection: Flak Jacket - 26 x 2.0", PSI 35-65, approximate weight 880g

Designed with valuable feedback from the 3-time EWS winner himself, the Sam Hill signature knee pads are the ultimate MTB knee pads for gravity riding, whatever your discipline. Light enough to be worn all day long, the Sam Hill knee pads mould with body heat to provide maximum comfort with a breathable mesh back panel to wick moisture away from the skin. CE EN1621-1:2012 Level 2. - High length compression design to prevent pad from slipping - Extra padding surrounding main knee cap for increased protection and support - Silicone printed gripper on inside of cuffs - Silicone printed logo on top and bottom outside cuffs to grip silicone on to shorts - Mesh back for increased airflow - Certified CE EN 1621-1:2012 Level 2 - Pre-curved fit for ultimate comfort - Weight 340g (size L)

Naughtvind Bibs balance warmth and breathability for unmatched comfort on cold-weather rides. We use fabric that’s water-, wind-, and abrasion-resistant on the outside and fleece-lined on the inside to keep the elements out and your body heat in. Pockets and reflective accents offer extra functionality and safety. The chamois-less design lets you pair Naughtvind Bibs with your favorite cycling shorts. We designed these winter cycling bibs to layer under our Naughtvind Pants for truly frigid days on the bike. - Chamois-less design for pairing with your favorite chamois shorts - Thermal fleece lining to retain body heat - Breathable mesh back for ventilation - 4/5 length fits with winter boots without bunching - Reflective accents for safety - Pocket storage for ride essentials - Made with sustainable materials

The Ultimate Drink Holder! ABC – ANY BOTTLE CAGE! Fits almost any bottle, cup, or container 2 1/4" to 4 3/4". Turn knob to tighten and turn to loosen. Crank it down so drink won't come out or set to desired interference fit for easy in or easy out. - Handlebar, frame, and seat post adapters available.

In order to bring EVO fun to the masses, we took our FACT 11m carbon frame (yes, the same one as the S-Works), dressed it with a bullet-proof SRAM GX Eagle 12-speed drivetrain and a tough-as-nails set of alloy wheels, and set it loose to shred unsuspecting trails everywhere. - All the travel in the world is useless without the proper shock tuning and kinematics. For the new Stumpjumper EVO design, we prioritized kinematic performance. Applying lessons learned while developing the Enduro, then following that with more than 1,000 hours of field and suspension lab development, we've not only improved the pedaling performance of the Stumpjumper, but we've made it more capable, agile, and lively. We increased anti-squat, so the suspension better resists pedal bob, and we further improved bump performance on square-edge hits. Bottom line? This thing shreds trails, not legs. - The S-Sizing geometry of the new Stumpjumper EVO is our most progressive yet. Long, low, slack, short offset fork, steeper seat tube angle—these are requirements for modern progressive riding. But not everyone jibs the same way, which is why the geo on the new Stumpjumper EVO is fully adjustable with six different settings. You can adjust the BB height by 10mm, you can adjust your head angle by two degrees, and you can make these adjustments independently of each other. Finally, if you want to go full-party mullet-mode, the EVO lets you run a 27.5-inch rear wheel mated with a 29-inch front. - Rider-First Engineered frames use a size-specific approach to ride characteristics that ensure benchmark handling and flawless performance, regardless of frame or rider size. Whether you're a jump-happy grom riding an S1 or a DH-fiend giant in need of the lengthy S6, you'll experience the same ride traits—rail-sharp cornering and balanced front and rear stiffness—at the lightest possible weight. - We introduced the SWAT door on the Stumpjumper in 2016, adding room IN your frame for those "oh sh*t" necessities like pumps and spare tubes and immediately rendering jersey pockets redundant. With the new Stumpjumper, we have increased the volume and added a SWAT Bladder, giving you an extra 22oz of water storage—the same size as a small water bottle—hidden in your downtube.

The Transfer v2 is more solid than ever. From the steel construction of the original to a new Flatlock hitch cam for enhanced stability in tow. Plus, a semi-integrated cable lock for an upgrade in security. The best part? The new Transfer v2 has the modular configurations available so you get a multi-rider rack at an everyone-friendly price. - Flatlock cam for 2", ball cam for 1.25" - Includes semi-integrated bicycle cable lock - Tamper-resistant hitch security - More robust hitch design for enhanced stability in tow - Holds up to a 50" wheelbase bike (previously 47") - Holds wheels 18"-29" (previously 20"-29") - Holds tires up to 5" with accessory strap (previously 4.5") + better hook clearance for loading fat bikes - Automotive-grade 750 hour salt spray hardware - Dedicated 2" hitch version in the 2 bike configuration can be directly mounted on campers, recreational vehicles, or trailers with CHASSIS MOUNTED RECEIVERS ONLY.

Topeak's Explorer Tubular Rack is a great add-on for carrying a trunk bag, pannier or anything else you want to strap on. It's made of tubular aluminum, fits most bikes, and has a center strip that acts like a short fender, too.

The all-new Levo delivers the unbelievable power to ride more trails through an unequaled combination of ride quality, usable power, and ride anywhere range. It's the distillation, application, and amplification of a 40-year obsession with creating the world's best riding mountain bikes. Since its introduction, Levo has set the bar every other e-MTB aims for, and the new Levo raises that bar again. It starts with our Turbo Full Power 2.2 motor and Turbo Connect Unit (TCU), which provides Levo with a smooth and seamless amplification of your efforts—4x power that lets you choose where to ride, and when you want to do it. Levo also shatters limitations when it comes to range, amplifying your effort for up to five hours of trail time. Now you can ride farther, and explore more, than ever before. And the optimized chassis boasts 150mm of custom-tuned rear suspension and adjustable geometry that delivers a stable and natural ride like no other. Because at the end of the day, it's the ride that matters. Believe it. Take your trail riding to a whole new level with the Turbo Levo Comp. Featuring our all-new M5 alloy chassis, SRAM's expansive GX Eagle 12-speed drivetrain, and buttery FOX Performance suspension, it'll have you riding circles around everyone else. - Levo's fully integrated Turbo Full Power 2.2 motor, 700Wh battery, and Turbo Connect Unit deliver category-leading 90 Nm of torque and 565 watts of power for up to five hours of ride time, empowering you to ride farther and faster than ever before. - The Levo's Turbo Connect Unit (or "TCU") is more than an "On-Off" button—it's the brains of the bike. The TCU shows your battery level and power-assist mode. It also communicates, via ANT+/Bluetooth, with our optional handlebar display to display even more information about your day's ride. - A dedicated mixed-wheel size design with a 27.5" wheel in the back and 29" upfront delivers a nimble ride that carves circles around other full-power e-MTBs. A generous cockpit centers you on the bike, optimizing traction and corner control. The low bottom bracket, slack headtube angle, and reduced fork offset keep things stable in the rough. - Levo offers six distinct geometry settings, allowing you to easily dial in its performance for any riding style and any terrain. Head tube angle can be adjusted between 63- and 65.5-degrees. Bottom bracket height can be fine-tuned up or down by 7mm. - Levo's 150mm of rear travel is supple on small bumps, devours square-edged hits without a twitch, eats massive G-outs for breakfast, yet still offers amazing pedal response and delivers your power to the ground with total efficiency. - The Levo's S-Sizing is based on what matters—rider size and style, not inseam. Six sizes, all with similar headtube lengths and standover, allow you to choose the size that best suits your individual style. Smaller S-Size numbers are going to be nimble and more flickable, while bigger S-Sizes deliver more stability and a roomier ride.

Lucky number 7 means gears a-plenty for most general riding. With a Shimano 7-speed derailleur, powerful front and rear linear-pull brakes and Electra’s Flat Foot Technology, the Townie 7D is the best-selling bike in the U.S. - The Original EQ comes fully equipped with Hub Dynamo powered front and rear bright LED lights and painted fenders to protect from the elements. - Schwalbe Big Apple 26" tires with a puncture-resistant casing roll smooth and stable over most surfaces. - Linear-pull brakes help control your roll with easy-stopping. - Enjoy the ride on our cushy, ergonomic and shock absorbent elastomer saddle. - Enjoy as-is, or personalize your ride with Electra accessories and make it your own with fenders, a basket or bell.

They say that every journey begins with a single step, but when that journey is related to exercise, that first step can sure be a doozy. It can be life-changing, however, and there's no better machine to take the plunge with than with the Roll. With its lightweight alloy frame, eight speeds of "go fast" gearing, stable and wide 650b tires, and powerful hydraulic disc brakes, the Roll does everything in its power to encourage and motivate you to keep fit and get around in comfortable, efficient style. - Equipped with a Body Geometry Comfort Gel saddle, you can expect a supreme level of comfort anywhere you ride. It is ergonomically designed and scientifically tested to provide unmatched comfort and support while reducing pressure on soft tissue. - The Roll is made of our A1 Premium Aluminum, and it features our Ground Control Positioning that makes it easy to put a foot down when stopped. This Roll also comes ready with rack/fender mounts. - Wide diameter, 650b x 2.3" Nimbus II Sport Reflect tires provide excellent traction, stability, and cushioning, which creates a safer, more reliable, and more comfortable ride on either paved or dirt roads. Plus, the reflective accents of the tire increase your visibility to motorists in low-light conditions.

We have a long history of developing the world's highest performing road bikes. Tarmac Venge Roubaix Allez Diverge-each one dominates their respective category featuring the best technologies in the industry. And while that's a tough palmares to follow the Turbo Creo SL redefines e-road bike performance. It's lightweight smooth capable and lively—all with the power to flatten mountains laugh at headwinds and go farther than you ever thought possible. It's you only faster. The Turbo Creo SL E5 Comp features an E5 Premium Aluminum frame and a Future Shock 1.5. For the spec we included a 1x Shimano GRX group to take on shifting and braking duties while DT R470 Boost wheels get wrapped in 28mm Turbo Pro tires to keep you rolling worry-free. And for the saddle you'll find that our fan-favorite Body Geometry Power Sport provides plenty of comfort. - The Creo SL is the lightest e-bike in its class-literally kilograms lighter than the competition. Not only does the lightweight and stiff, premium E5 alloy frame inspire dancing on the pedals and diving into corners, it also reduces overall system weight and increases the range. - The lightweight SL 1.1 motor doubles your effort with as much as 240 watts of silent and powerful assistance to amplify your ride. The motor's responsive torque curve delivers power perfectly in-tune with your normal riding cadence and leaves no resistance when riding unassisted. - Battery anxiety? Not on the Creo SL. With up to 80 miles of range from the internal battery, the Creo SL eats up big miles and long days. Our optional range extender provides up to 40 additional miles of mountain-flattening power. - By connecting with our Mission Control App, you're able to tune the SL 1.1 motor to your riding style, record rides, and monitor the battery. The app can handle battery management automatically too, ensuring the battery will last as long as you need it to. The motor even has a built-in power meter that transmits to any ANT+ head unit. Don't want to connect? No worries-the Turbo Connect Unit (TCU) on the top tube gives you all the control you need to ride. - With 20mm of rough-road-taming travel, the Future Shock 1.5 not only delivers a smoother, more comfortable ride, but it also reduces fatigue and increases speed over harsh terrain. The new Smooth Boot, meanwhile, enhances the aesthetics to bring a clean transition from the head tube to the stem. - We've learned there can be more difference between two male cyclists than between a male and a female cyclist. Gender alone doesn't provide enough data to specialize. It means that separating bikes as male or female is arbitrary and outdated. With this in mind, we've developed a geometry that's best-fit for all riders-one that's comfortable, snappy, and handles like a dream.

As beautifully elegant as it is rugged, the Aventure is the most powerful and versatile ebike we've ever designed. With a front suspension fork, fat tires, and exceptional handling, you get the most comfortable ride across whichever terrain your spirit chooses, while built-in fenders and integrated front and rear lights ensure that wherever you go, you'll be both seen by others and protected from the terrain beneath you. While the Aventure ships as a class II ebike, it can be configured into a class III with its high capacity battery and powerful rear hub motor. Topping it off is a color display that syncs to the new Aventon app. This bike is first in its class and packed full of the technological innovation required to stand up to the test of time. The Aventure comes in 3 sizes to suit almost all adults and teens: - Small 5'1" - 5'7" - Medium 5'7" - 5'11" - Large 5'11" - 6'4"

The new Transfer v2 models can each be expanded to carry an additional bike with the 1-Bike Add-On. Increase the capacity of your 1-Bike, 2-Bike, or 3-Bike rack to carry up to 4 bikes* with all the features you expect at a price that's unexpected. *Add-Ons cannot be stacked. Only a single 1-Bike Add-On can be attached to Transfer v2 models. The 1.25"-2" Transfer v2 2-bike (SKU T202B) model cannot take a one-bike add-on. - Automotive-grade 750 hour salt spray hardware - Holds up to a 50" wheelbase bike (previously 47") - Holds wheels 18"-29" (previously 20"-29") - Holds tires up to 5" with accessory strap (previously 4.5") + better hook clearance for loading fat bikes