Skip to main content

Filter By:

  • Show More Sizes
  • Show Fewer Sizes

Mountain Frames

ACF's mountain bike frames are the most technologically advanced on the market.

Trek X-Caliber Frame
$599.99
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
Trek 1120 Frameset
$999.99
1120 Frameset is a bikepacker's dream, ready to be built up as your ultimate all-terrain touring bike. This bike is made for exploring the most extreme backcountry destinations in the farthest reaches of the world, and it's great for fast overnight bikepacking trips and sub-24s, too. It's right for you if... You want to build up a ride for bikepacking and off-road touring in places other bikes simply can't take you. You’re looking for a lightweight and sturdy frame that's purpose-built for hauling all your gear anywhere you wanna go. The tech you get A Stache-inspired Alpha Platinum Aluminum frame with an adjustable rear Stranglehold Dropout that makes it easy to dial in your geometry and convert to singlespeed, a carbon fork, mounts for our proprietary 1120 rack system, and internal derailleur and dropper post routing. Comes with a headset and front and rear thru-axle skewers. The final word Every part of 1120 Frameset is designed for better bikepacking and built to take on the burliest trails you can find. Spec it how you like and build up your ideal rig for epic adventures. Why you'll love it - So many mounting features let you set up your ideal expedition ride as you see fit - The available 1120 rack and harness system makes it easy to secure the 8L bags dry bags of your choice in the rear rack and additional bags up front for the best packing balance - It's also an awesome mountain bike—if you're looking to shred, pull off your gear and racks and it's every bit as capable as our award-winning Stache
Trek Farley AL Frameset
$999.99
Farley AL is a high-value platform for your fat bike build. This lightweight Alpha Aluminum fat bike frameset has the ride characteristics of a traditional trail bike, with all the monster truck capability that comes with fat bike tires. Includes carbon fork. Built to accommodate 26x5" or 27.5x4" wheels. It's right for you if... You're looking for a light, strong, alloy fat bike frame with a trail-optimized geometry for stability and responsiveness on any trail in any season. The tech you get A lightweight Alpha Platinum Aluminum frame with adjustable horizontal sliding dropouts, suspension-corrected OCLV Carbon Bontrager Haru Pro fork, and FSA headset. Rear thru axle dropout is 197mm, fork thru axle dropout is 15x150mm. The final word High-value fun in any season. Farley AL is fast, fun, and capable, and you're getting a great jumpstart on your build with an included Bontrager carbon fork. Why you'll love it - If you were under the impression that fat bikes were sluggish, this bike will change your mind - It's a four-season freedom machine that lets you ride outside all year long - You can run your choice of wheels with 26x5" or 27.5x4" tires
Trek Session 27.5 Carbon Frameset
$1,800.00 $4,999.99 64% Off
You need a bike that will not only withstand the brutal demands of downhill, but excel at them. You need a proven winner on the World Cup circuit. You need Trek's Session frameset. This lightweight, tough OCLV carbon frame rocks a Fox Performance DHX 2 SLS coil that'll keep you in control on the roughest, rockiest DH courses in the world. Trek's Full Floater and ABP technologies isolate suspension action from braking input to keep your rear tire tracking smoothly, even when braking hard. Build it up with the bomber components that make you fast, and go shred the hardest line you can find.
Trek Slash AL Frameset
$2,099.99
Slash AL frameset is the perfect platform for a fast 29er enduro or trail bike build. With a burly Alpha Aluminum frame, Trek's exclusive RE:aktiv with Thru Shaft shock, and a Knock Block integrated headset, you have all the bones for a mountain bike that can handle everything from the biggest all-mountain descents to the most competitive enduro races. It's right for you if... You want a high-value head start on your enduro build and the kind of trail tech that comes only from a long heritage of all-mountain riding. You like to go fast, go big, and rail corners, and you're looking for a big bike that will stand up to whatever wild trails you can find. The tech you get A burly Alpha Aluminum frame, a shock with Trek's exclusive RE:aktiv with Thru Shaft damper, and an integrated Knock Block headset that stops spinning bars and the fork crown from hitting your frame. Built for 29er wheels and a 150mm or 160mm fork. The final word With Slash AL frameset, you're getting a whole lot of capability for your money and a great start on a bike that can handle the burliest trails out there. Whether you're racing or looking to get sendy, this burly frameset will stand up to whatever you throw at it. Why you'll love it 1 - RE:aktiv works faster than a normal shock, so it tracks the ground better and keeps you in control 2 - It's equally at home between the tape and in the rugged wild—Yes, Slash is a race bike, but it's ridiculously fun on gnarly trail rides, too 3 - We're not the only ones who love it: Slash was awarded Mountain Bike of the Year by Pinkbike
Trek Session AL 27.5 Frameset
$2,199.99
Session AL 27.5 frameset is a burly alloy downhill mountain bike frame that's equally at home between the tape and at the DH park. It's built for 27.5-inch wheels, with 210mm of travel and a FOX Performance VAN shock tuned by Trek Suspension Lab. It's right for you if... You're looking to build a rugged DH or park bike for the biggest trails out there, and want a 27.5-inch optimized frameset with exclusive trail tech, like adjustable Mino Link geometry, that can't be found anywhere else. The tech you get A burly Alpha Platinum Aluminum frame, an adjustable FOX Performance shock with 210mm of travel, integrated frame protection, FSA Orbit headset, and exclusive trail tech like ABP, Full Floater, and Mino Link. Built for 27.5-inch wheels. The final word This burly frameset is perfectly capable of taking on the roughest, fastest descents you can find, and it's equally at home in the park, too. The best DH frame tech, a stable geometry, and a quality shock give you a head start on your dream downhill rig. Why you'll love it 1 - Session has the heart of a monster truck: it rolls over everything, gives you the confidence to take on rougher trails, and saves you when you don't take the right line 2 - Quality FOX Performance suspension and our ABP frame design keep you in control 3 - Race or get rowdy? This bike does both 4 - 27.5 wheels are great for flicking the bike around through the most technical trail
Trek Procaliber SL Frameset
$2,699.99
For fast XC riders and cross country mountain bike racers who want to cover a lot of ground fast, there's no better hardtail frameset than Procaliber SL. It's built with Super Light OCLV Mountain Carbon and delivers the unique trail-smoothing advantage of IsoSpeed, which takes the edge off fatiguing bumps in the trail so you can stay stronger longer. It's right for you if... You want to fly up climbs, rail the corners, charge through technical sections of trail, and win every sprint to the line. You have a dream XC build in mind, and you want to start with the lightest carbon hardtail frame we offer. The tech you get A superlight SL OCLV Mountain Carbon frame with Control Freak internal cable routing and trail-smoothing IsoSpeed. The Procaliber SL frameset includes a headset, and is designed for post-mount disc brakes and a PF92 bottom bracket. The final word Smoother. Lighter. Faster. Procaliber SL was built to win the XC game. The ultra-lightweight SL OCLV Mountain Carbon frame with IsoSpeed delivers serious performance for serious riders. Why you'll love it - This SL OCLV Mountain Carbon frameset is the ideal start to an obscenely lightweight cross country build - The IsoSpeed decoupler makes it ride smoother than any other hardtail, so your body doesn't get beat up by trail chatter - Control Freak Cable Management allows you to run any combination of cables exactly the way you want, while still giving you sleek looks and protecting your cables against unnecessary wear - Boost148 spacing on all frame sizes except S, which has a 142x12mm rear axle
Trek Fuel EX C Frameset
$3,299.99
Fuel EX C is a carbon mountain bike frameset built for high-performance rides on a variety of trails. The best in Trek trail bike frame tech, a full OCLV Mountain Carbon frame, and 130mm of rear travel with a FOX Factory shock make Fuel EX C the ideal start for a dream trail bike or endurance race bike that's burly enough to go big on gnarly descents but quick enough to fly through the local singletrack circuit. It's right for you if... You're after that one holy grail mountain bike build that lets you power through flowy singletrack, hit gnarly descents and drops, and even compete in marathon races. You want the best all-around trail bike frame we offer, because you know a high-quality frame is the ticket to faster, bigger rides. The tech you get A light and stiff full OCLV Mountain Carbon frame, a FOX Performance shock with Trek's exclusive RE:aktiv damper, and an included Bontrager Line stem and Knock Block headset that prevents damage to the frame from spinning handlebars and fork crowns. Built for a PF92 bottom bracket and a 140mm fork. The final word A full OCLV Mountain Carbon frame and FOX Factory shock give you a major head start on a build that will be the envy of all other trail bikes. Fuel EX C is a frameset that excels in all-mountain riding, and it's the best all-around option for riders who want a single versatile, high-performance ride that rips it up on every trail. Why you'll love it - A full OCLV Mountain Carbon frame makes for a ride that's light on the climbs and trail-tough on rough descents - RE:aktiv with Thru Shaft works faster than a normal shock, so it tracks the ground better and keeps you in control - This bike is perfect for shredding singletrack, hitting drops, and pushing your limits in multi-stage and marathon events - A sleek internal storage compartment gives you a versatile spot to stow tools and gear - We expanded our size range from XS through XL to ensure a better fit for all riders
Trek Session 27.5 Carbon Frameset
$3,999.99
Going down? World Cup champion Session is built to win. An all-new OCLV Carbon frame, updated geometry, advanced air shock, and a stiffer chassis make this downhill race bike faster than ever. Session is the DH bike that excels on downhill's most brutal courses. Take on any terrain with our most advanced suspension and a geometry that can be dialed for every race. Key features: - Longer, more aggressive geometry keeps you attacking the whole way down - OCLV Mountain Carbon with Carbon Armor is downhill tough - Fine-tune your ride with Mino Link and an all-new adjustable headset system - Fast 27.5" wheels get you down the mountain first
Page 1 of 1