Fuel EX 7 is a do-anything trail machine evolved to eat up singletrack. Upgraded 150mm front and 140mm rear suspension smooth out rough and technical descents, while a lightweight aluminum frame keeps things lively on the climbs. New in-frame storage and adjustable geometry give you all the perks that come with the carbon model, without the price tag. Tubeless wheels, and reliable Shimano SLX 1x12 drivetrain round-out this build for ultimate trail fun. You're looking for a ride-anything full-suspension with stepped-up components, like a supple RockShox Gold RL fork that gobbles up rock gardens for fun and flowy descents. A lightweight alloy full-suspension frame with 150mm RockShox Gold RL fork with DebonAir spring for small bump compliance, and a FOX Performance rear shock. Plus, a 1x12 Shimano SLX drivetrain and wide Bontrager wheels with tubeless tires and a dropper post. New adjustable geometry that lets you take control of your setup. For the all-mountain rider, Fuel EX 7 takes the cake. Its capable geometry is ready to rally the mountain, and upgraded suspension and drivetrain keep you riding all day. - You get all-mountain power with upgraded components that are ready to progress with you on the trail - We expanded our size range to ensure a better fit for all riders, and use the best-fitting wheels for each frame size: X-Small frames get 27.5" wheels, Small frames get to choose between 27.5" or 29", and sizes Medium and up get 29" wheels - The dropper post gets your saddle out of the way when you're ripping corners and smashing descents. - With the adjustable angle headset (angled cups sold separately) and Mino Link, you can choose from six different geometry configurations

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.

X-Caliber 8 is a cross country mountain bike made for fast laps and long days on the trail. It's built with special attention to value and the parts that make the biggest difference in performance. A 1x Shimano drivetrain, RockShox fork, and hydraulic disc brakes make it a great choice for new mountain bikers and XC racers searching for fast, fun, singletrack adventure. It's right for you if... You're looking for a fast mountain bike for singletrack—one that's fully capable of taking on races, marathons, and competitive group rides. You want something that is reliable and fun with dependable, lightweight parts. The tech you get A lightweight aluminum frame, a RockShox Judy SL 100mm suspension fork with a TurnKey lockout and an air spring that's lighter and more adjustable than a coil spring, tubeless ready wheels with Boost141 hub spacing, and a Shimano Deore 1x12 drivetrain with a wide-range cassette. The final word With X-Caliber 8, you're getting a performance frame paired with performance parts, like a RockShox air fork and 1x Shimano Deore drivetrain. Plus, it's equipped with durable, lightweight alloy rims that save weight and are easy to upgrade to tubeless. Why you'll love it - It has the price of a more basic hardtail, but the parts and performance of a more expensive one - The frame is fully compatible with higher-end parts, like race wheels and a dropper post, if you ever find the need to upgrade - Smart Wheel Sizing means you'll get the fastest wheel that fits (29" wheels on larger frames, 27.5" wheels on smaller frames) - The 1x drivetrain delivers a wide range of gearing with the simplicity of a single shifter Wheel size: - Sizes X-Small – Small: 27.5-inch - Sizes Medium – XX-Large: 29-inch

Marlin 8 is a confidence-boosting trail bike with updated geometry that gives you more control on singletrack without skipping on features for everyday use, like mounts for racks and a kick stand. It's built for years of progress thanks to 12-speed SRAM shifting, and an upgraded RockShox air spring suspension fork. It's right for you if... You want a bike that's ready to progress with you on the trail, and is versatile enough for daily riding to school, work, and grocery shopping. The tech you get A lightweight aluminum frame with modern trail riding geometry and internal routing that keeps cables protected and keep the bike looking sleek. An air-spring RockShox fork that's lighter and more adjustable than a coil spring, wide-range SRAM shifting, and the serious stopping power of hydraulic disc brakes. The final word Marlin 8 is a progressive trail bike ready for building skills on the singletrack, and taking on daily life, too. It packs in premium features where you want them so you can build skills for years to come. Why you'll love it - You get real-deal modern mountain bike geometry that keeps handling confident when you're on singletrack, but it's versatile enough for use on roads and bike paths, too - You get a premium RockShox fork with an air spring that's lighter and more adjustable than a coil - You get the simplicity and range of 1x12 drivetrain for putting down power on the trail - The included dropper post lets you get your saddle out of the way when you roll into technical sections and steeper descents. - Marlin models in sizes XXS and XS have a curved top tube and lower standover height that makes it easier for smaller riders to mount and dismount Features: Expanded size range With 8 different sizes, Marlin has a bike made to fit every rider. Each frame is equipped with smart wheel sizing, with XXS frames rolling on 26" wheels, and wheel sizes increasing proportionally along with frame sizes, so every rider gets the fit they need. Trail-ready, Upgrade-ready The secret to Marlin's popularity is a real trail-savvy mountain bike frame that's upgrade compatible, so it can grow with you as you take on bigger trails and tougher features. Roll stronger with Thru Skew Goodbye open dropouts. The Thru Skewer is a better, stronger, more precisely aligned rear wheel retention system that keeps your wheel more secure than quick-release skewers while still using the standard 135mm rear hub spacing.

X-Caliber 9 is the top-end model in the X-Caliber family. It's a fully race-ready cross country mountain bike built with parts designed to compete. A RockShox Recon fork, a 1x12 Shimano XT/SLX drivetrain, and a wide-range cassette make it a great choice for fast singletrack riders who want a great bike that's ready to race right out of the box. It's right for you if... You measure your rides in speed and distance, and want a fast XC bike that will help you cover more trail in less time. You race, or you could see yourself getting into racing, so you want a hardtail with competition-level parts that can give you an advantage on the trail. The tech you get A lightweight aluminum frame, a RockShox Recon Gold 100mm suspension air fork, a Shimano XT/SLX 1x12 drivetrain with a wide range of gears for easier climbing. Plus, tubeless ready wheels with wider Boost141 hubs for increased wheel strength and better tire clearance, and a dropper post for getting low on descents. The final word X-Caliber 9 is a speedy, nimble, and efficient XC hardtail that's perfect for riders with a racing pedigree and anyone who dreams of covering epic distances out on the trail. Why you'll love it - It's a great bike for someone who's just getting into serious racing: you get high-end XC parts on an awesome frame with enough cash left over for entry fees - There's nothing as sweet as a silent ride: the clutch rear derailleur prevents chain slap, even in the rough - The frame is fully compatible with higher-end parts, like race wheels, if you ever find the need to upgrade - The 1x drivetrain delivers a wide range of gearing with the simplicity of a single shifter Wheel size: - Size Small: 27.5-inch - Sizes Medium – XX-Large: 29-inch

Marlin 4 is the gateway mountain bike that will take you from rail trails to singletrack. It's ideal for riders who want a mountain bike with knobby tires that can double as a rugged commuter. Disc brakes, front suspension, Shimano 14-speed shifting, and mounts for a rack and fenders make this a great bike for 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. THE TECH YOU GET A lightweight aluminum frame with internal routing to protect your cables and add to the bike's sleek look, trustworthy 14-speed Shimano shifting with a wide range of gearing so you always have the right gear for your terrain, powerful mechanical disc brakes, and a suspension fork that takes the edge off bumps and rough terrain. THE FINAL WORD Marlin is made for any adventure. 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 - Marlin Gen 2 is ready to roll with easy to use features that help you get the best bang for your buck - Rack and fender mounts make it easy to accessorize, so your mountain bike can double as a rugged commuter - 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 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 - Like every model in the Marlin family, it's backed by Trek's lifetime warranty Wheel size: - Sizes X-Small – Small: 27.5-inch - Sizes Medium – X-Large: 29-inch

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

Marlin 8 is a race-worthy mountain bike that won't break the bank. The smooth, lightweight RockShox fork, tubeless ready wheels, and wide-range 1x drivetrain make this model the best choice for new riders who want a fast cross country hardtail that will hold its own against our higher-end race bikes. It's right for you if... You want a race-ready mountain bike with upgrades on the parts that make a big difference in performance, like a lighter, higher quality suspension fork, wide-range 1x drivetrain, and tubeless ready wheels. The tech you get A light frame with internal cable routing, a smoother-feeling RockShox Judy Silver fork with a Solo Air spring and TurnKey hydraulic lockout, Shimano hydraulic disc brakes, tubeless ready Bontrager Kovee wheels, and a simple 1x12 drivetrain that ditches the front derailleur for less clutter and easier operation. The wide-range 11-50 cassette gives you all the gears you need for clawing up climbs and blazing down descents. The final word The tubeless ready wheels, RockShox suspension, wide range of gearing, and quality parts make it an awesome choice for new mountain bikers who know they want a serious bike for their money. It's fully capable of taking on big trail adventures and XC races. Why you'll love it - This is one of our most popular bikes for good reason. You get 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 - The RockShox fork's Solo Air spring can easily be adjusted for a specific rider weight, and it's lighter than a coil spring - Setting your wheels up tubeless reduces the overall weight of your bike and the chances you'll get a flat - The 1x drivetrain gives you all the gears you need and none you don't - 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 Wheel size: - Size XX-Small: 26-inch - Sizes X-Small – Small: 27.5-inch - Sizes Medium – X-Large: 29-inch

Marlin 7 is your best friend on the trail and wherever else you roll thanks to its confidence-boosting trail geometry. It finds the perfect balance between price and performance with an upgraded RockShox suspension fork that makes quick work of rocks and bumps in your path, and precise Shimano Deore shifting. It's right for you if... You want a go-anywhere trail bike that's got upgrades where it matters most, but won't break the bank. You want to build skills on the trail, and need a bike with confidence-inspiring geometry. The tech you get A lightweight aluminum frame with modern trail riding geometry and internal routing that keeps cables protected and keep the bike looking sleek. An upgraded RockShox suspension fork that smooths out rowdy trails, 10-speed fuss-free Shimano Deore shifting, and the serious stopping power of hydraulic disc brakes. The final word Marlin 7 is the go-to trail bike for those wanting to build skills on the singletrack and get the right bang for the buck with upgraded suspension and confidence-inspiring geometry. Why you'll love it - You get real-deal modern mountain bike geometry that keeps handling confident when you're on singletrack, but it's versatile enough for use on roads and bike paths, too - Its upgraded RockShox fork gives you 100mm of suspension for turning rocks and roots in the trail into smooth-sailing - Rack and fender mounts make it easy to accessorize, so your mountain bike can double as a rugged commuter - Internal routing makes it easy to add a dropper post that lets you lower you saddle on the fly for more confident descending - Marlin models in sizes XXS and XS have a curved top tube and lower standover height that makes it easier for smaller riders to mount and dismount Features: Expanded size range With 8 different sizes, Marlin has a bike made to fit every rider. Each frame is equipped with smart wheel sizing, with XXS frames rolling on 26" wheels, and wheel sizes increasing proportionally along with frame sizes, so every rider gets the fit they need. Trail-ready, Upgrade-ready The secret to Marlin's popularity is a real trail-savvy mountain bike frame that's upgrade compatible, so it can grow with you as you take on bigger trails and tougher features. Roll stronger with Thru Skew Goodbye open dropouts. The Thru Skewer is a better, stronger, more precisely aligned rear wheel retention system that keeps your wheel more secure than quick-release skewers while still using the standard 135mm rear hub spacing.

Time to explore the outdoors and get into mountain biking on this great entry-level 27.5 MTB, featuring disc brakes. Features - If you're looking to get started in the adventurous world of mountain biking, then the MTB Sport Disc is a great place to start. - The MTB Sport Disc is equipped with a Zoom 100mm travel suspension fork and Shimano TX800 21-Speed RapidFire gearing, and runs on the popular 650B (27.5 inches) size wheelset with JAKS disc brakes.

Time to explore the outdoors and get into mountain biking on this great trail-ready 27.5 MTB, featuring disc brakes. Features - If you're looking to get started in the adventurous world of mountain biking, then the MTB Pro Disc is a great place to start. - The new 27.5 mountain bike is equipped with a Zoom 100mm travel suspension fork with pre-load adjust and mechanical lockout, and Shimano TX800 24-Speed RapidFire gearing. This mountain bike runs on the popular 650B (27.5 inches) size wheelset for the perfect balance of smooth handling, quick acceleration, and added stability.

Marlin 6 is the perfect ride for progressing your skills on the trails. Its updated slacker frame geometry makes it easier to control on descents while the suspension fork takes the edge off bumpy trails. Integrated rack and kickstand mounts make it easy to add accessories to this versatile steed. It's right for you if... You want a trail bike that's dialed for building confidence on the dirt, and versatile enough for commuting to work or school. The tech you get A lightweight aluminum frame with modern trail riding geometry and internal routing that keeps cables protected and keep the bike looking sleek. A front suspension fork that cushions rocks, roots, and bumps in the trail, 10-speed fuss-free Shimano Deore shifting, and the serious stopping power of hydraulic disc brakes. The final word Marlin 6 is an ideal trail bike for riders who want to progress on the trail, and want a bike that can keep them rolling off of the trail, too. Why you'll love it - You get real-deal modern mountain bike geometry that keeps handling confident when you're on singletrack, but it's versatile enough for use on roads and bike paths, too - Rack and fender mounts make it easy to accessorize, so your mountain bike can double as a rugged commuter - The new Thru-Skew system is safer, simpler, and stronger, plus it makes removing the rear wheel for flat fixes a cinch. - Internal routing makes it easy to add a dropper post that lets you lower you saddle on the fly for more confident descending - Marlin models in sizes XXS and XS have a curved top tube and lower standover height that makes it easier for smaller riders to mount and dismount Features: Expanded size range With 8 different sizes, Marlin has a bike made to fit every rider. Each frame is equipped with smart wheel sizing, with XXS frames rolling on 26" wheels, and wheel sizes increasing proportionally along with frame sizes, so every rider gets the fit they need. Trail-ready, Upgrade-ready The secret to Marlin's popularity is a real trail-savvy mountain bike frame that's upgrade compatible, so it can grow with you as you take on bigger trails and tougher features. Roll stronger with Thru Skew Goodbye open dropouts. The Thru Skewer is a better, stronger, more precisely aligned rear wheel retention system that keeps your wheel more secure than quick-release skewers while still using the standard 135mm rear hub spacing.

Fuel EX 9.8 XT is a playful and capable trail bike that blends together cherry-picked components with a light full carbon frame for the best balance of price and performance. Decked out with 150mm of front and 140mm rear FOX Performance suspension package, you'll be ready to float through the chunder, while carbon wheels keep tracking precise through rowdy terrain. A Shimano XT drivetrain tops things off for precise shifting for power on descents and relief on long climbs. It's right for you if... You're chasing long flowy and technical descents, and want to pedal back to the top for more, lap after lap. You want the vibration damping benefits of a carbon frame and carbon wheels, plus upgraded suspension that smooths out the rough and rowdy. The tech you get A light and stiff carbon frame with a full FOX Performance suspension package that smooths out rowdy rock gardens and root lattices. Plus, carbon wheels that keep your setup light and tracking precise, and the clean shifting and brake modulation of a Shimano XT drivetrain. Finally, you'll find adjustable geometry and in-frame storage for keeping your setup dialed just for you. The final word Fuel EX 9.8 is the culmination of years of trail riding and progression, with longer front end geometry for tackling steeper and hairier descents, and a steeper seat tube to keep you perched on climbs. It's equipped with the cherry-picked components you want, like upgraded suspension, carbon wheels, and a Shimano XT drivetrain. Why you'll love it - Fuel EX Gen 6 gives you 140/150mm of travel with extra adjustability features and more stable handling, plus a more robust frame with internal storage - We expanded our size range to ensure a better fit for all riders and use the best-fitting wheels for each frame size: XS frames get 27.5" wheels, S frames get to choose between 27.5" or 29", and sizes M and up get 29" wheels - It's ready to rip with lightweight carbon wheels that easily tackle rough terrain and hold their line when things get rowdy - In-frame storage makes it easy to bring along all of your essentials while keeping your setup streamlined and sleek - With the adjustable angle headset (angled cups sold separately) and Mino Link, you can choose from six different geometry configurations

Fuel EX 9.8 is a hard-charging trail bike with a light and stiff carbon frame that's smooth, quiet, and holds its own when you pick a line. It's loaded with the latest tech like a wireless SRAM GX AXS drivetrain that's super clean looking and customizable. 150mm front and 140mm rear suspension keep you in control on the roughest trails and it's all topped off with carbon Bontrager wheels with a quick-engaging hub. You want a full suspension ride that can handle anything you throw its way. You want the vibration damping benefits of a carbon frame and wheels, rock-gobbling premium suspension, and appreciate when you can keep your setup clean and minimalist with wireless 12-speed shifting. A light and stiff carbon frame with a full FOX Performance suspension package that turns chunky rock gardens into smooth sailing. Carbon wheels that keep weight down while offering stiff and reliable tracking. Plus, the wireless shifting of SRAM GX AXS, and tubeless hoops and tires so you can spend less time fixing flats. Finally, you'll find adjustable geometry and in-frame storage for keeping your setup dialed just for you. Fuel EX 9.8 is the evolution of years of trail riding, with longer front geometry for taking on steep descents, and a steeper seat tube for hammering back up to do it again. Its carbon frame keeps things light, and SRAM GX AXS shifting takes things up a notch for those who want the latest tech. - Its lightweight carbon frame and progressive geometry are built to tackle steep and gnarly descents and punchy climbs alike - It comes with light and stiff carbon wheels that make quick work of technical terrain and keep you on your line, even when things get hairy - You get the latest technology in SRAM's workhorse GX groupset, with wireless AXS shifting - With the adjustable angle headset (angled cups sold separately) and Mino Link, you can choose from six different geometry configurations Wheel size: - Sizes X-Small – Small: 27.5-inch - Sizes Small – X-Large: 29-inch

Fuel EX 8 is the ideal trail bike for riders who want a versatile full suspension ripper that makes soul-crushing climbs less painful, but can also huck rowdy trails. It hits the sweet spot of value and performance in our mountain bike lineup by combining high-end parts with a stout but light alloy frame. It's right for you if... You're cool with your wheels leaving the ground, but you also like to go the distance on marathon singletrack sessions. You want a bike that lets you crush any trail, and your priority is on the parts. The tech you get An alloy frame, 140mm FOX Rhythm 34 fork, and 130mm of rear travel with an extra-efficient RE:aktiv damper. A Shimano XT 1x12 drivetrain with an extra-low 51-tooth climbing gear, powerful 4-piston brakes, Bontrager wheels with a 54-tooth Rapid Drive hub for fast engagement plus a Bontrager Line dropper post. The final word Fuel EX 8 gives you added efficiency with Shimano's latest, widest-range drivetrain and Trek's unique RE:aktiv damper that provides firm pedaling support without giving up any plush compliance. Why you'll love it - A wider gear range and more efficient suspension help you claw your way up tricky climbs you never thought you'd clean - If you measure quality in performance per dollar, you won't do better than Fuel EX 8 - This bike will make you want to rail every corner, smash every rock garden, and charge every descent - The shifter-style, underbar remote dropper post lever is super intuitive and easy to use - We expanded our size range to ensure a better fit for all riders. And, you get the fastest wheel that fits your frame: XS frames get 27.5" wheels, S frames get to choose between 27.5" or 29", and sizes M to XL get 29" wheels Wheel size: - Sizes X-Small – Small: 27.5-inch - Sizes Small – XX-Large: 29-inch

Fuel EX 9.9 makes no compromises. A carbon frame, carbon wheels, SRAM's X01 Eagle 1x12 drivetrain, and FOX Factory Float suspension make this the one carbon full suspension mountain bike that rules every trail. It's fast on singletrack, light on climbs, and stable through the rowdiest terrain you can find. It's right for you if... You're a mountain biker through and through, and want a single carbon bike for the best performance on everything from marathon races to gnarly descents and technical trail. You know you'll be riding this bike on every trail, so you're not going to compromise on frame material, suspension, or components. The tech you get A light and stiff full OCLV Mountain Carbon frame, 140mm FOX Factory 36 Float fork with GRIP2 damper, 130mm of rear travel with a FOX Factory Float shock featuring Trek's exclusive RE:aktiv with Thru Shaft, and a 1x12 SRAM X01 Eagle drivetrain. Plus, powerful Shimano XT 4-piston hydraulic disc brakes, Tubeless Ready Bontrager Line Carbon 30 wheels with a 54-tooth Rapid Drive rear hub for quick engagement, a Bontrager Line Elite dropper post, and a Bontrager Line Pro OCLV Carbon handlebar. An internal storage compartment and Control Freak cable routing add to the bike's capability and sleek look. The final word If you can have just one mountain bike, this is it. Fuel EX 9.9 has the highest-end parts on the best OCLV Mountain Carbon frame we make. It's equally at home on fast singletrack, gnarly trail, and laying down miles on your next multi-stage race. Why you'll love it - Fuel EX 9.9 is the single best choice for riders who want an all-mountain ripper that excels at everything from marathon races to burly technical terrain to singletrack - RE:aktiv with Thru Shaft works faster than a normal shock, so it tracks the ground better and keeps you in control - A sleek internal storage compartment gives you a versatile spot to stow tools and gear - We expanded our size range to ensure a better fit for all riders. And, you get the fastest wheel that fits your frame: XS frames get 27.5-inch wheels, S frames get to choose between 27.5-inch or 29-inch, and sizes M to XL get 29-inch wheels - Make it yours: it's fully customizable through Project One