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 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 Alpha Gold Aluminium frame, a RockShox 30 Silver suspension fork with a lockout and an air spring that's lighter and more adjustable than a coil spring, Bontrager Kovee Tubeless Ready wheels with Boost141 hub spacing and a smooth, efficient Shimano Deore/XT 2x10 drivetrain with a Shimano XT Shadow rear derailleur, which stays tucked out of the way to avoid snagging on trail debris.
The final word
With X-Caliber 8, you're getting a performance frame paired with performance parts, like a RockShox air fork and a rear derailleur that's the gold standard for MTB performance and reliability. Plus, it's equipped with durable, lightweight alloy rims that save weight and are easy to upgrade to tubeless.
favorite_borderWhy you'll love it
- It has the price of a more basic hardtail and the performance of a more expensive one
- The RockShox air fork can be tuned to the rider's weight, so you always have a custom ride that's right for you
- 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)
Locked suspension means your fork remains inactive, increasing pedalling efficiency. Perfect for extended road sections where efficiency is more important than bump absorption.
Smart Wheel Size
The right wheel size paired with your frame size gives you the perfect combination of responsiveness and control.
Internal derailleur routing
Sleek ports at the head tube and near the seat tube let you route your derailleur cables through the frame to keep your bike running smooth and clean.
Going for a long ride? Rack mounts make carrying accessories a breeze.
Alpha Gold Aluminium
Our high-performance lightweight aluminium is continuously cold extruded and butted, and formed into manipulated tube shapes to balance strength and save weight.
Extended size range
A wider range of sizes than the industry standard provides more options for everyone, from tallest to shortest and all those in between. Because everyone deserves a great ride.
Dropper post internal routing
Not ready for an internally routed dropper post now, but want to keep your options open? Select frames are equipped with the proper entry and exit points to accommodate internal routing for a Stealth seat post.
Boost141 is the wider hub standard for open dropouts. Wider dropouts and wider hub flanges give you stiffer wheels. In addition, it lets you run wider tyres and a larger chain ring without affecting q-factor and pedalling efficiency.
Advanced frame geometry and a custom offset fork give our 29ers precise handling at low speed without compromising high-speed stability. We call it G2 Geometry, and it's why our 29ers handle better than anyone else's.
- Alpha Gold Aluminium, tapered head tube, internal derailleur and dropper post routing, rack and kickstand mount, Boost141, G2 Geometry
- RockShox 30 Silver, Solo Air, rebound adjust, TurnKey hydraulic lockout, tapered steerer, G2 Geometry w/51 mm offset on 29ers, 100 mm travel (13.5: 80 mm travel)
- Front hub
- Formula DC20 LW alloy
- Rear hub
- Formula DC2241, Boost141
- Bontrager Kovee 28-hole Tubeless Ready, tubeless rim strips and valves sold separately
- Bontrager XR2, 29x2.20˝ (13.5 & 15.5: 27.5x2.20˝)
- Shimano Deore M6000, 10-speed
- Front derailleur
- Shimano Deore M617
- Rear derailleur
- Shimano Deore XT M781, Shadow
- Race Face Ride, 36/22
- Bottom bracket
- Shimano BB52, 73 mm
- Shimano HG50, 11-36, 10-speed
- KMC X10
- VP-536 nylon platform
- Bontrager Arvada
- Bontrager alloy, 2-bolt head, 31.6 mm, 12 mm offset
- Bontrager alloy, 31.8 mm, 5 mm rise, 720 mm width (13.5: 690 mm width)
- Bontrager XR Trail Comp, nylon lock-on
- Bontrager Elite, 31.8 mm, 7-degree, Blendr compatible
- Head set
- Semi-integrated, cartridge, 1-1/8˝ top, 1.5˝ bottom
- Brake set
- Shimano MT200 hydraulic disc
- M – 13.43 kg/29.6 lbs (with tubes)
- Weight limit
- This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).
Sizing & fit
Proper bike fit is essential for best performance and comfort. Any size and geometry measurements shown on our website are for general comparison purposes only. To find your perfect fit, visit an authorised Trek retailer, where an expert skilled at sizing will help you find the appropriate bike and size for your individual needs.
137.0- 155.0 cm
64.0- 73.0 cm
153.0- 166.5 cm
72.0- 79.0 cm
161.0- 172.0 cm
76.0- 81.0 cm
165.5- 179.0 cm
77.0- 84.0 cm
177.0- 188.0 cm
83.0- 88.0 cm
186.0- 196.0 cm
87.0- 92.0 cm
195.0- 203.0 cm
92.0- 95.0 cm
All measurements provided in cm unless otherwise stated.
|Frame size number||Frame size letter||Wheel size||A — Seat tube||B — Seat tube angle||C — Head tube length||D — Head angle||E — Effective top tube||F — Bottom bracket height||G — Bottom bracket drop||H — Chainstay length||I — Offset||J — Trail||K — Wheelbase||L — Standover||M — Frame reach||N — Frame stack|