Mountain bike frames

The frame is the foundation of every mountain bike. It shapes the geometry, defines how the bike rides, and determines where it performs best. From smooth, flowing trails to steep technical climbs and full-on bike park laps, the right frame makes the difference when it comes to control, comfort, and confidence on the trail.

Our selection covers everything from lightweight, efficient hardtail frames to capable full-suspension frames - available with or without a rear shock, depending on the model. Many frames come in multiple versions, so you can choose between a lightweight carbon mountain bike frame for racing and marathon riding or a tough aluminum option built for trail abuse and bike park use. Because we only carry current MTB frames with modern standards like Boost spacing, tapered head tubes, and UDH compatibility, you get a future-ready base for your next custom build or upgrade project.

A custom build starts with the right frame - and we’re here to help you get it right:

• Wide selection: Hardtail or full-suspension, carbon or aluminum, 27.5" or 29" - all key options for your dream build in one place.
• Clear, detailed product info: Size charts, geometry tables, and full spec sheets give you everything you need to compare frames and choose with confidence.
• Flexible financing: Building a bike is an investment. Our financing options help you spread the cost and get riding sooner.
• Fast shipping: Your frame ships quickly and securely, so your build doesn’t stall before it starts.
• Expert support: Our customer service team knows MTB tech inside and out and is happy to help with compatibility or setup questions.

Frame size depends on your height and inseam. Modern mountain bike geometries run longer and more stable, offering improved control at speed. Our frame size guide walks you through what to look for and how to dial in the right fit.

The right MTB frame should match your riding style, terrain, and ambitions. Choosing between hardtail and full-suspension, carbon and aluminum, as well as wheel size and intended use, has a major impact on how your bike feels on the trail. Modern 29er (29-inch) MTB frames deliver stability and traction, while 27.5-inch frames stand out for their agility and playful handling. Geometry plays a huge role too - long and slack for gravity-focused riding, shorter and steeper for XC efficiency. Frame material and construction influence weight, stiffness, and vibration damping, helping you fine-tune your setup from the ground up.

Direct, efficient, and low-maintenance, hardtail frames are a go-to choice for cross-country, marathon, and trail riding. With no rear suspension, every pedal stroke goes straight into forward motion, making hardtails especially efficient on climbs and fast sections. Modern designs feature slacker head angles for added control on technical trails. Paired with 100–150 mm of front travel, hardtail frames handle roots and rocks with ease while delivering precise trail feedback. A strong choice for racing, long tours, and riders who value simplicity and efficiency.

Full-suspension frames shine on rough trails and demanding terrain, offering increased traction, control, and comfort. Rear suspension absorbs impacts and keeps both wheels planted, improving grip in corners, confidence on descents, and reducing fatigue on long rides. Depending on the discipline, travel ranges from 100 mm for XC all the way up to 200 mm for downhill. Modern suspension layouts like Horst Link or VPP improve efficiency while boosting sensitivity - ideal for trail, all-mountain, enduro, and riders who push hard in technical terrain.

To find a frame that truly fits your setup, it’s worth looking at a few key factors. Riders who spend most of their time on steep, technical descents need very different geometry than those focused on XC racing or marathon distances.

• Material: Carbon MTB frames are lightweight, stiff, and excellent at damping vibrations - a great choice for racing, marathon riding, and long days in the saddle. Aluminum frames are tough, durable, and deliver strong performance at a more accessible price.
• Intended use: Cross-country and marathon setups prioritize efficiency and low weight. Trail and all-mountain frames focus on versatility. Enduro frames are built around downhill performance with solid climbing ability, while downhill frames are designed purely for speed and stability on extreme descents.
• Wheel size: 29er MTB frames offer stability and traction, while 27.5" frames feel more agile and maneuverable. Mullet setups combine both, running a 29" wheel up front and a 27.5" wheel in the rear.
• Frame design: Hardtail frames deliver efficiency, low weight, and a direct ride feel. Full-suspension frames deliver more traction, control, and comfort on rough trails and challenging terrain.
• Travel: 100–120 mm suits XC and marathon riding, 120–150 mm works well for trail and all-mountain, and 150–200 mm is designed for enduro and gravity riding. More travel adds control on descents but reduces climbing efficiency.
• Standards and compatibility: Boost spacing (148 mm rear, 110 mm front), a tapered head tube, and compatible bottom bracket standards (BSA, Pressfit, or T47) are now standard. Look for ISCG tabs, generous tire clearance, and UDH compatibility, which simplifies derailleur hanger replacement and is required for modern SRAM Transmission drivetrains.
• Extra features: Flip chips for geometry adjustment, mullet compatibility, internal cable routing (including electronic drivetrains), and integrated frame protection add versatility and future-proofing to modern MTB frames.

Unboxing a frame, pressing in the headset, installing the fork - few moments in cycling feel as satisfying as building your own bike from the ground up. At BIKE24, you’ll find a wide selection of MTB frames backed by detailed specs, fast shipping, and a team that offers practical advice based on real workshop experience.

You’ll also find suspension forks, headsets, bottom brackets, and seatposts to complete your dream MTB build in one place.