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An eco-conscious bike jersey that offers versatile performance with comfortable materials in a fitted cut. - 37.5™ active-particle technology keeps your body at an ideal core temperature - Raw edge sleeve with silicone gripper for a comfortable and stay-put fit - Three open back pockets plus additional inset card pocket - Drop-tail design with silicone gripper covers your backside in riding positions for a cycling-specific fit - This product saves the equivalent of 14 PET plastic water bottles - UV protection 50+

Don't get us wrong, we're all for racing. Grand Tour top steps, Classic's Monuments—they're in our DNA. But sometimes riding simply to ride, riding for the love of riding, is just what we need. And this is what the Aethos lives for. Sure, it's given nothing up to performance and happens to be the lightest frame out there, but with no compromise to style. Aethos: Billions of calculations in the pursuit of one thing—the perfect ride. Top off the world's lightest frame with Shimano's legendary Dura-Ace Di2 groupset and Roval's featherweight Alpinist wheels and you're left with a perfectly balanced top-tier ride that gives up nothing in the name of performance. The Aethos frame has been designed with the perfect combination of ultimate ride feel, lightweight, and style—from accelerating up steep pitches and descending technical descents, to all-day saddle comfort on even the longest coffee rides, the Aethos hits the mark. But how, you ask? By reinventing the traditional road shape found on bikes of the past, we've subtly altered these shapes to deliver massive gains in stiffness and balance, all without affecting weight or durability. Pair that with an entirely new layup and process that we've perfected over multiple decades and you have the lightest frame out there (585 grams, S-Works, size 56cm). The Aethos is more than just a new bike, it's the first of a new breed. - A featherweight frame is useless without confidence-inspiring ride characteristics, which is why we've developed the Aethos to have the perfect balance of front and rear stiffness combined with exceptional ride quality. By studying the flexing and breathing of carbon fiber, we were able to discover groundbreaking findings about how forces flow through frames. Just a few pedal strokes and you'll realize this sublime ride sets a new standard. - Every detail, from the derailleur hangers to the fork expander plug have been designed with style, weight, and durability in mind. We've also spec'd it with Roval's all-new Alpinist carbon seatpost and wheels, further saving weight and improving ride characteristics. Everything in pursuit for the perfect ride.

E-bikes add to the riding experience by simply providing more for less. More distance, more laps, more climbs and more descents. With all those "mores" also comes more weight continually bashing on the components of an e-bike. In order to overcome the increased forces induced by the technological progression of modern e-bikes, we designed our HTZ rims with more material in every area of the rim prole. Every wall of the rim is 25-30% thicker in comparison to those on our standard rims, which we then paired with our proven I-Beam center support to ensure no beating was too great for these rims. All HTZ rims are TCS 2.0 tubeless, feature asymmetrical spoke drilling, and are available in widths ranging from i23 to i35 in order to provide options for e-bikes ranging from e-assist gravel bikes to dual-crown downhill bikes that no longer need a truck to be shuttled. FEATURES: - Capable of withstanding the forces of a modern e-bike. - 4D angled spoke drilling eliminates binding and lateral loading and disperses tension more evenly over a greater area. - Symmetric outer profile provides equal dissipation of impact forces on both sides of the rim while asymmetric spoke hole drilling allows for more even spoke tension and increased wheel strength. - Disc-brake only. - TCS 2.0 Tubeless ready and comes with a preinstalled Solid Strip, which lies beneath the tubeless tape and prevents sagging at the spoke holes, creating a smooth interface between the rim and tire bead. This prevents air from escaping around the bead and therefore requires less air volume and pressure to mount a tire. Solid Strip also protects the airtight tubeless system from being punctured in the case of a broken spoke. TCS 2.0 creates a more robust, easily installed, and dependable tubeless system. USAGE: E-bike

The MET Terranova MIPS is designed for trail and eMTB riding. The construction and fit are inspired by MET's Roam helmet, guaranteeing optimal comfort. The increased head coverage ensures a higher level of protection around the two most sensitive brain areas: the back and the temples. Featuring the MIPS-C2 brain protection system, the Terranova is able to slide against the head in the case of a crash, redirecting damaging rotational motion. The tool-free adjustable visor is injection-molded to flex and bend when there is an impact against it. This unique feature helps to manage extra rotational forces transferred to your neck in a crash. The Terranova MIPS also features two dedicated ports to securely dock sunglasses while climbing or resting. The 360° head belt in the MET Safe-T DUO retention system ensures that there will be no pressure points on the skull and makes the helmet perfectly stable on the head while riding on rugged terrains. - In-mold polycarbonate shell with EPS liner - Fully polycarbonate wrapped EPS liner enhances durability - Extended head coverage for more thorough head protection - MIPS-C2 Brain Protection System offers extra protection in the case of certain impacts - MET Safe-T DUO Fit System - The 360° head belt with vertical adjustments allow for a customized fit - The injection-molded visor is adjustable and flexible to avoid extra rotation of the neck in case of a crash - Sunglass ports to securely dock sunglasses when climbing or resting - Exceptionally comfortable and secure on the head thanks to refined internal shape - 17 vents are internally engineered for air channeling to improve ventilation and comfort - Certifications CE; AS/NZS; US Sizing: - Small/Medium = 52 – 56cm - Medium/Large = 56 – 58cm - Large/X-Large = 58 – 61cm

From the outset of the Torch 3.0 Road shoe design process, our goal was to create a performance offering as feature-packed as any top-end shoe. The challenge, however, was pulling this off at a palatable price. In order to achieve this, we utilized three strategically placed materials on the uppers that are welded together—TPU and mesh in the front and synthetic leather in the rear. This makes for a more comfortable and supportive front of the shoe. A stiff rear and heel cup, meanwhile, lock down your heel and keep all of your watts going into the pedals as efficiently as possible. This refined upper is combined with our legendary FACT carbon fiber sole to further ensure an efficient power transfer. Finally, we topped the Torch 3.0 off with two Boa S2-SV Snap dials for zonal closure, and a precise fit that leads to all-day comfort. - Body Geometry sole construction and footbeds are ergonomically designed and scientifically tested to boost power, increase efficiency, and reduce chance of injury by optimizing hip, knee, and foot alignment. - FACT carbon composite sole and torsion box construction is directionally rigid for outstanding power transfer: Stiffness Index 8.5. - Dual Boa S2-SV Snap dial closure for on-the-fly micro-adjustment, backed by the Boa Lifetime Guarantee. - Mesh, TPU, and synthetic layer upper are placed in specific zones for comfort and lock-down, and are thermobonded for a superior fit. - Standard Fit for support and all-day comfort. - Three-bolt cleat pattern fits all major road pedals. - Approximate weight: 248g (1/2 pair, Size 42)

More fun with more flow Climb to new heights, roam further, and rider harder in the Foray Mountain Shoe. An undeniably comfortable off-road cycling shoe featuring a Boa IP1 dial for a superior fit on rides of any length and intensity. No matter where or how you ride, this shoe won't quit thanks to a stiff sole with a durable upper with the added protection of GnarGuard for an overall reliable trail shoe. - inForm Race last offers a slightly roomier, high-performance fit - Nylon composite Bronze Series sole provides stiff yet walkable performance - Single Boa L6 dial allows easy and precise fit adjustments - Tachyon rubber outsole allows great grip in all terrains - Stiffness index 6 of 14 - Durable, GnarGuard rubberized coating protects against abrasions and fights debris - Compatible with 2-bolt SPD-style cleats

Tool Clamp Tips for use with the RockShox Rear Shock Clamp Tool. - For rear shock damper servicing - For use with the RockShox Rear Shock Clamp Tool - Compatible With: Super Deluxe A1-B2 (2017-2021), Thrushaft C1+ (2021+)

Flared Adventure and Gravel bar made of EC90 carbon composite - 16 degrees of flare (adds 68mm to bar width at tip of drops) - Each width of bar has a unique diameter and length ergonomic top section - Maximum Contact Drop (MCD) shape for comfort and control - Internal routing for Di2 wiring - 208g @ 42cm (width measured center-to-center)

Rims: WTB HTZ i30 29" - ETRTO 622-30 - Inner width: 30mm - 6061 series aluminum - Asymetric and angled spoke hole drilling distributes spoke tension more evenly - Reinforced I-Beam profile - Strong sleeved joint - Drilled for Presta valve - TCS 2.0 Tubeless System compatible - Solid Strip included - Tubeless valve included - 32 holes Front hub: Shimano HB-MT400-B Boost - 15x110mm (Axle not included) - Center Lock (6-Bolt adapter included) - Angular contact bearings - Contact sealed hub Assembled in North America by experienced wheelbuilders with Sapim Race spokes (Black), 14mm Brass Polyax Nipples (Black)

Made for modern XC tracks—240 hub + 30 mm carbon rim = super-fast! Tailored to the needs of performance-oriented cross-country riders, the XRC 1501 SPLINE ONE leaves nothing to be desired. The light, 30mm-wide carbon rims offer ideal support for modern XC tires. Rolling on race-proven and super-durable 240 hubs with RATCHET EXP freehub system, every bit of your energy is transferred into forward motion via equally racy double-butted spokes and a perfect wheel build.

Innovative kayak carrier that is safe, stylish, easy to use, and integrates seamlessly with Thule roof rack systems. Features - Quickly raise or fold when not in use using the convenient front release handle - Easily manage load straps while strapping down the kayak using the integrated StrapCatch - Kayaks are protected during transit due to the durable and soft rubber padding - Theft resistant design keeps carrier securely attached to load bars (locks included) - Easy to install directly into the Thule WingBar Evo or AeroBlade T-track, or around Thule SquareBar via the integrated, tool-free mounting hardware (SquareBar requires an adapter) Technical specifications - Load capacity: 75 lb - Dimensions: 18 x 8 x 17.5 in - Weight: 15.2 lb - Rubber cover for strap buckle - Lockable - One Key System compatible Fits the following Thule crossbars: - WingBar Evo - AeroBlade Edge - AeroBlade - SquareBar (Adapter/s required: Thule SquareBar Adapter 4-pack) - ProBar - Xsporter Pro

HIGH PERFORMANCE TRAIL-CONQUEROR All new Tallac combines advanced off-road footwear technology with bike-specific performance to offer a trail flat shoe that's designed to outlast the biggest epics. The Cordura upper is breathable and lightweight, but also trail-tough and protective with a stitch-free and fully welded construction. The new adaptable outsole has a supportive pedal contact area featuring our MAX GRIP rubber for a confident connection with the pedal when charging the trail ahead. Compliant reverse hex traction in the toe and heel make easier work when hiking becomes necessary. Features: - MAX GRIP rubber outsole - Hexagon outsole featuring reverse hex traction pattern on toe and heel for hike-able climbs and descents - EVA midsole provides support and shock absorption - D3O High Impact Zone Technology insole absorbs impact and reduces fatigue - Lightweight bonded upper featuring Cordura mesh for durability and breathability - Anti-bacterial mesh lining controls odor - Fully gusseted tongue prohibits intake of dirt and debris - Elastic lace tuck to keep laces secure - TPU mud guard to protect against dirt, debris and rubbing - TPU toe and heel protection with reinforced anti-abrasion film - Heel pull tab for easy entry

The Mukluk is Salsa's most versatile fat bike, designed and engineered to excel in a wide variety of conditions. The frame utilizes 197mm rear spacing to accommodate up to 5" tires, and the 100mm threaded bottom bracket allows a wide range of crank (Q-factor) choices. Alternator 1.0 dropouts allow for short chainstays and easily support single speed or geared drivetrain options. The Mukluk can do it all.

The industry standard comes in all sizes. Premium-quality Bontrager Standard butyl rubber tubes feature a 0.9mm wall thickness for the perfect balance of weight savings and durability. - 0.9mm wall thickness - Equipped with removable valve cores - 100% inspected for guaranteed quality - Best value 27-inch tire size equivalents - 700cx 23 – 25 also fits 27 x 7/8 – 1 - 700c x 28 – 32 also fits 27 x 1-1/8 – 1-1/4 - 700c x 35 – 44 also fits 27 x 1-3/8 – 1-3/4

Tannus Armour is the ultimate in tire protection and performance for all levels and styles of riding. Sitting between your tire and inner tube, the Tannus Armour provides 15mm of puncture protection on the top, as well as 2mm of sidewall protection from sharp objects and rocks. Whether you are a city biker, adventure tourer or prefer the off-road, downhill or gravel trails, Tannus Armour gives you increased grip and vibration dampening for a smoother, more comfortable and enjoyable ride. - Patented Aither Technology; Aither is a multi-cell foam compound that forms the structure of the Armour

The Terry Tech Tee is a deal for those times when you just don't need/don't want to wear a bike jersey. Casually styled yet packed full of performance, it provides a street smart approach to bike apparel. Beyond the loose, flowing fit, the magic is in the moisture wicking, antimicrobial fabric Terry uses to keep you dry and odor free, no matter what. -  88% polyester/12% spandex - moisture-wicking and antimicrobial - simply styled crew neckline provides good coverage - mobility-friendly raglan sleeves - single rear patch pocket with flap - custom graphics - Relaxed Fit - Moisture Wicking - Antimicrobial

This is the correct plug-and-play wire for Shimano's E-Tube Di2 electric-shifting systems. It comes in sixteen different lengths, so choose the one(s) that's right for your Di2 E-Tube wiring configuration.

Your bike is your freedom. Trails, bike paths, and roads await. The LT3 Hard-Case Ultimate is an all-condition, light trail specialty tire that's designed for fast rolling on both pavement and trails without having to worry about rocks or debris causing flats. - Excels on light to moderate trails - Open tread design for trail use

The S-Works Torch is the latest evolution of the winningest footwear in cycling. Using Body Geometry together with biomimicry, data science, and obsessive craftsmanship, we engineered a shoe so thoughtfully constructed that you’ll forget you’re wearing it. Leveraging data science, we refined every detail of the S-Works Torch’s upper for improved fit and performance. The BOA cable is shifted down and angled, preventing lift on the ball of the foot and delivering power-enhancing structure while eliminating unwanted pressure or pinching. Adaptive materials allow natural movement of the foot where needed for comfort, while data-driven zonal reinforcement keeps the foot secured for crisp power delivery and optimal efficiency. Guided by more than 100,000 foot scans from our RETÜL fit data, we recognized that both a standard and a wide carbon base plate would best serve the spectrum of human foot shapes. An internal I-Beam adds stiffness and strength, eliminating the need for additional bracing. The result is a 20-gram weight reduction, enhanced efficiency, and immediate power transfer. Following RETÜL biomechanical data, we created an asymmetric heel cup that supports natural knee alignment and delivers the positive hold riders love while enhancing comfort by accommodating more room for the Achilles heel. The S-Works Torch is scientifically crafted to disappear on your feet and off the front. - New upper features reinforcement in key zones while also offering fit zones to create a disappearing fit on the foot. - Based on data gathered from Retül foot scans, the new base plate is 4mm wider at the ball than the previous generation of S-Works 7 shoe. - By optimizing its construction, the new carbon plate is 20g lighter than the S-Works 7. An internal "I-Beam" ensures it maintains the same stiffness as the previous generation. - An updated last makes use of Retül data to better match the shape of riders' feet, sloping more towards the lateral side to give a snug, close-to-foot fit. - Asymmetrical heel counter supports the medial side while removing material from the lateral side, allowing for a lower collar. - Updated BOA cable routing improves lockdown while reducing pressure across anterior ankle ligaments. - Independent alloy BOA S3-Snap Fit System for on-the-fly micro-adjustment, backed by the BOA Guarantee. - Titanium alloy cleat nuts can rotate to position pedal/cleats 5mm rearward. Three-bolt cleat pattern fits all major road pedals. - Non-slip, replaceable heel tread with internally recessed screws for security. *** IMPORTANT FOR WIDE FIT*** the new base plate is 4mm wider than the standard width (8mm wider than S-Works 7).

Want to take your workstand with you? These padded, heavy-duty Tote Bags allow you to easily store and transport your Feedback Sports workstand (sold separately). These great cases will protect your stand and they have sturdy handles for easy carrying. - Choose from Ultralight, Pro Elite, Pro Classic, Sport Mechanic, Recreational, and A-Frame work stands - Heavy-duty bag for toting and storage - Full zipper and carrying straps

The ARC 1400 DiCut wheels also benefit from the AERO+ profile supporting safe riding in the aero position through optimal aerodynamics. The combination of new and proven aero components allows cyclists to control many riding situations at high speeds. - AERO+ optimized rims by Swiss Side - Stainless steel bearings

Lezyne's Femto Drive Pair are compact, bright, and beautifully made front and rear safety lights. The Femto Front is an ultra-compact safety light with integrated lens On/Off switch. Durable machined aluminum construction. Side Visibility lens extends beyond body to provide 180 degrees of visibility. Two replaceable CR2032 batteries power one bright LED. Up to 15 lumens with two output/flash options. Available in seven unique anodized colors. Versatile 2-in-1 Clip-On System straps to bars or clips to loops. The Femto Rear mirrors the design of the Femto Rear, but puts out up to 7 lumens of red light with two output/flash modes.

SRAM's 1x Eagle component system boasts a twelve-speed cassette. We built pulleys that can handle the load better than stock. These CeramicSpeed Pulley Wheels work with less drag, adding to the power transmitted to the rear wheel while offering greater durability, going longer between replacement intervals. These pulleys are also fully compatible with the SRAM Eagle AXS derailleur. The aluminum pulleys with standard bearings are 34.4% more efficient than stock and use our low-drag, long-life Standard Bearing with hardened-steel races and our super-round CeramicSpeed balls. The upper and lower pulleys both have a narrow-wide tooth design with 14 teeth each. As the upper and lower pulleys have different tasks, they have different shapes. You'll find they are thus marked, and have directional arrows. These pulleys should be installed with stock SRAM pulley spacers. Save those from your old pulleys before installing CeramicSpeed. The kits come with CeramicSpeed Oil in a 15ml dropper bottle and grease in 5ml syringe. The bearings come pre-oiled. The grease can be used on the pulley bearings when riding in particularly harsh environments. In the box: - 2 x 14-tooth pulley wheels - CeramicSpeed Bearing Oil in 15ml dropper bottle - CeramicSpeed Grease in 5ml syringe - Sticker sheet

Yep, we just re-read the spec sheet and still can't believe it either. The Rockhopper Elite is one helluva lot of bike. Air-sprung fork? Let me introduce you to your new friend, Judy. Discerning when it comes to your drivetrain? You'll find no fault—and no grade too steep—with a wide-range Shimano Deore 1x11 drivetrain. Why stop there? We didn't, in order to allow you the pleasure of stopping yourself with Shimano's eager-to-please and oh-so-capable MT200 hydraulic disc brakes. Each is impressive in their own right, but the magic really lies in how they all come together into a Rockhopper that serves up singletrack with a nice big side of "Whoah, so that's what a real bike feels like." - A heart of gold, presented in our lightweight yet durable Premium A1 Aluminum, the Rockhopper's butted aluminum frame features hydroformed top and downtubes in order to keep weight low and strength high, all while providing increased standover clearance, slick internal cable routing and dropper-post compatibility. - With the goal of making sure that the Rockhopper offers both the best fit and best performance for every person, no matter their measure, we've paired each Rockhopper frame size with the optimal wheel size. The result is a Rockhopper to fit every rider and the assurance that every Rockhopper is rolling on the best-handling wheel for its frame size. - Pair dead-reliable hubs from Formula with our 25-millimeter internal diameter, hookless Stout rims for a wheelset hat-trick: strong, light and durable.

Slash 9.9 is the fastest enduro mountain bike in the lineup, so it's no surprise it's the go-to ride for the pros of Trek Factory Racing Enduro. A full carbon frame, all-new hard-charging suspension with RockShox Flight Attendant, fast-rolling carbon wheels, and a SRAM wireless electronic drivetrain and dropper make this top-of-the-line ride the undisputed king of enduro. It's right for you if… You're looking for the kind of enduro bike that can rip it up on the world's biggest stage. You want the very latest tech like electronic shifting and the new Flight Attendant electronic damper from RockShox. The tech you get A full OCLV Mountain Carbon frame with 160mm of travel and a RockShox Super Deluxe Ultimate shock with an updated Thru Shaft damper, a RockShox ZEB Ultimate fork with extra-beefy 38mm stanchions. Plus, RockShox Flight Attendant wireless electronic damping control automagically adjusts your suspension to best suit the terrain. A wireless electronic SRAM X01 Eagle AXS drivetrain with a 10-52 cassette, Reverb AXS dropper, Bontrager RSL integrated bar/stem, and Line Pro 30 carbon wheels with a 108-tooth Rapid Drive hub. The final word There's not a single part on this bike that wasn't made for ripping it up at insane speeds on the wildest enduro courses in the world. And you get RockShox Flight Attendant that automatically adjusts your suspension damping so you can focus on flying down the trail. Why you'll love it: - The RockShox ZEB fork's bigger 38mm stanchions help you stay on your line through the chunky stuff, while the updated damper lets you dial in the feel - The OCLV Carbon RSL integrated bar/stem is ultralight, ultra-comfortable, and it looks awesome - RockShox Flight Attendant uses wireless sensors in the fork, shock, and crank to automatically adjust your suspension damping to the terrain. It's one less distraction from the trail ahead - Wider seat tube, wider dropper-the 34.9mm diameter post is stronger, more durable, and moves up and down faster - A large internal storage compartment in the down tube lets you stow tools and gear

Campagnolo Pulley Assemblies

Get the road shoe that checks all the boxes for the committed road cyclist. Velocis is designed for the road bike rider that needs one pair of cycling shoes to give them more of what they want. The Boa System provides a perfect fit that locks in power through every pedal stroke. If you're not careful, sponsors may come calling. Key features - inForm Pro last delivers an ergonomically optimized, high-performance fit - Silver Series carbon/fiberglass composite sole for added stiffness - Boa IP1 dial for precise, two-way adjustment - Stiffness index 10 of 14 - Perforated synthetic uppers allow increased breathability and comfort - Sole Fiber Content: Carbon Composite - Liner Fiber Content: Shell: 100% Polyester, Lining: 100% Polyester

45NRTH utilizes a two-piece construction method to create a reliable and high-performing bicycle tire stud with a concave carbide-aluminum design. The open space and edges created by the large concave crown result in twice the surface area for increased traction and grip. - Concave tip for traction, durability, and longevity - Aluminum base to save weight - Compatible with 45NRTH stud insertion tool - Compatible with all studdable 45NRTH tires - 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.

Busy city streets and dim neighborhood roads, the Smith Express MIPS bike helmet is all-in when it's commuting time. The advanced angled impact protection of MIPS pairs with a clean, minimalist shape for a look that's cool and casual with the protection you want. Add the visor to help cut the glare, and adjust the fit with the turn of a dial. A pop-in rear light and reflective straps help boost visibility any time of day. PROTECTION: Lightweight in-mold construction, MIPS Brain Protection System reduces rotational forces caused by angled impacts to the head FIT / INTEGRATION: Adjustable dial fit for easy, on-the-go size adjustment FEATURES: 13 fixed vents for consistent airflow, Lightweight, low-bulk single layer webbing with reflective details, Removable fabric visor, Integrated removable rear vent light WEIGHT: (Size M, MIPS) 12oz / 330g CERTIFICATION: CPSC,CE EN 1078

Marlin 6 is a cross country mountain bike built to give you an efficient off-road ride with a suspension fork that locks out, and a simple 1x drivetrain. It's made for mountain biking, but it's also equipped with features like rack and kickstand mounts that make it a great choice for adventurous daily commutes. 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 A lightweight aluminum frame with internal routing to protect your cables and add to the bike's sleek look, powerful hydraulic disc brakes, and a simple 1x10 Shimano drivetrain that ditches the front derailleur for less clutter and easier operation. The wide-range cassette still gives you all the gears you need for big climbs and steep descents. Plus, a suspension fork with a lever that lets you easily lock the suspension so you don't waste energy on smooth terrain. The final word Marlin 6 gives you upgrades you'll notice on every ride, like the smooth, simple shifting Shimano drivetrain. Extra-strong, double-walled rims and powerful hydraulic disc brakes give you durability and stopping power for your most rugged adventures on the trail, in town, and everywhere in between. Why you'll love it - The 1x drivetrain gives you all the gears you need and none you don't - Smaller frame sizes (XXS, XS, and S) have short-reach brake levers that make it easier and more comfortable for riders with smaller hands to brake confidently - Marlin models in XXS through 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