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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 100 mm suspension fork with a lockout and an air spring that's lighter and more adjustable than a coil spring, tubeless-ready wheels with Boost141 hub spacing and a smooth, efficient SRAM SX Eagle 1x12 drive train 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 SRAM Eagle drivetrain. Plus, it's equipped with durable, lightweight alloy rims that save weight and are easy to upgrade to tubeless.
The Walkthrough
favorite_borderWhy you'll love it
- It has the price of a more basic hardtail, but the parts and performance of a more expensive one
- The RockShox air fork has a rebound adjust and can be tuned to the rider’s weight, and it’s way higher quality than what you’d normally get on an MTB at this price
- 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 drive train delivers a wide range of gearing with the simplicity of a single shifter
Features
Built for speed
X-Caliber is a classic XC hardtail with quick-handling geometry, weight-conscious parts and just enough suspension to take the edge off bumps. These models are built for efficiency, making them great for racers or anyone else who wants to cover more ground in less time.
High tech frame
The Alpha Gold Aluminuum frame is packed with features that make your ride better. A tapered head tube gives you more precise, confident handling on the front end, while Boost 141 rear hub spacing gives you shorter chainstays for more nimble handling at the back.
Smart Wheel Size
The right wheel size paired with your frame size gives you the perfect combination of responsiveness and control.
Suspension lockout
Locked suspension means your fork remains inactive, increasing pedalling efficiency. Perfect for extended road sections where efficiency is more important than bump absorption.
Internal cable routing
We route shift and brake cables through the frame to keep things clean and simple. And it looks great, too.
Blendr stem
Bontrager stem technology lets you clip your gear directly to the stem for clean looks and maximum user friendliness.
Learn more
Rack mounts
Going for a long ride? Rack mounts make carrying accessories a breeze.
Rear kickstand mount
Chainstay mounts make it easy to install a rear kickstand that stays out of your way and supports bikes of all sizes. No more laying or leaning.
Internal dropper compatible
Internal routing ports make it easy to add a dropper post upgrade that lets you lower your saddle on the fly so it's out of your way for tricky sections of trail.
Specifications
*spec applies to all sizes unless otherwise noted
| Frame | Alpha Gold Aluminium, tapered head tube, internal derailleur and dropper post routing, rack and kickstand mount, Boost141, 5 mm QR |
|---|---|
| *Fork |
Size:
XS RockShox Judy SL, Solo Air spring, TurnKey lockout, tapered steerer, 42 mm offset, Boost110, 15 mm Maxle Lite, 80 mm travel |
|
Size:
S RockShox Judy SL, Solo Air spring, TurnKey lockout, tapered steerer, Boost110, 15 mm Maxle Lite, 100 mm travel |
|
|
Size:
M, M/L, L, XL, XXL RockShox Judy SL, Solo Air spring, TurnKey lockout, tapered steerer, Boost110, 15 mm Maxle Stealth, 100 mm travel |
| Hub front | Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Boost110, 15 mm thru axle |
|---|---|
| Hub rear | Formula DCL-141Q, sealed bearing, 6-bolt, Shimano 10 freehub, Boost141, 5 mm QR |
| *Rim |
Size:
XS, S, M, M/L, L, XL, XXL Bontrager Kovee, double-wall, Tubeless Ready, 28-hole, 23 mm width, Presta valve |
|
Size:
XS, S, M, M/L, L, XL, XXL Bontrager Kovee, double-wall, Tubeless Ready, 32-hole, 23 mm width, Presta valve |
|
| Spokes | 14 g stainless steel, black |
| *Tyre |
Size:
XS, S Bontrager XR3 Comp, wire bead, 30 tpi, 27.5x2.20'' |
|
Size:
M, M/L, L, XL, XXL Bontrager XR3 Comp, wire bead, 30 tpi, 29x2.20" |
| Shifter | SRAM SX Eagle, 12-speed |
|---|---|
| Rear derailleur | SRAM SX Eagle |
| *Crank |
Size:
XS, S SRAM SX Eagle, GXP, 30T steel ring, Boost, 170 mm length |
|
Size:
M, M/L, L, XL, XXL SRAM SX Eagle, GXP, 30T steel ring, Boost, 175 mm length |
|
| Bottom bracket | Truvativ Powerspline, 73 mm, threaded cartridge, 118 mm spindle |
| Cassette | SRAM PG-1210 Eagle, 11-50, 12-speed |
| Chain | SRAM SX Eagle, 12-speed |
| Pedal | VP-536 nylon platform |
| Saddle | Bontrager Arvada, steel rails, 138 mm width |
|---|---|
| *Seatpost |
Size:
XS, S Bontrager alloy, 31.6 mm, 12 mm offset, 330 mm length |
|
Size:
M Bontrager alloy, 31.6 mm, 12 mm offset, 360 mm length |
|
|
Size:
M/L, L, XL, XXL Bontrager alloy, 31.6 mm, 12 mm offset, 400 mm length |
|
| *Handlebar |
Size:
XS Bontrager alloy, 31.8 mm, 5 mm rise, 690 mm width |
|
Size:
S, M, M/L, L, XL, XXL Bontrager alloy, 31.8 mm, 5 mm rise, 720 mm width |
|
| Grips | Bontrager XR Trail Comp, nylon lock-on |
| *Stem |
Size:
XS, S Bontrager Elite, 31.8 mm, Blendr-compatible, 7-degree, 60 mm length |
|
Size:
M Bontrager Elite, 31.8 mm, Blendr-compatible, 7-degree, 70 mm length |
|
|
Size:
M/L, L Bontrager Elite, 31.8 mm, Blendr-compatible, 7-degree, 80 mm length |
|
|
Size:
XL, XXL Bontrager Elite, 31.8 mm, Blendr-compatible, 7-degree, 90 mm length |
|
| Head set | Semi-integrated, loose ball bearing, 1-1/8" top, 1.5" bottom |
| Brake | Shimano MT200 hydraulic disc |
| *Brake rotor |
Size:
XS, S, M, M/L, L, XL, XXL Shimano RT26, 6-bolt,160 mm |
|
Size:
L, XL, XXL Shimano RT26, 6-bolt,180 mm |
| Weight | M - 13.80 kg / 30.42 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 trekbikes.com are for general comparison purposes only. To find your perfect fit, visit an authorised retailer, where an expert skilled at sizing will help you find the appropriate bike and size for your individual needs.
Rider Height
Inseam
XS
137.0 - 155.0 cm
4'5.9" - 5'1.0"
64.0 - 73.0 cm
25.2" - 28.7"
S
153.0 - 166.5 cm
5'0.2" - 5'5.6"
72.0 - 79.0 cm
28.3" - 31.1"
M
161.0 - 172.0 cm
5'3.4" - 5'7.7"
76.0 - 81.0 cm
29.9" - 31.9"
M/L
165.5 - 179.0 cm
5'5.2" - 5'10.5"
77.0 - 84.0 cm
30.3" - 33.1"
L
177.0 - 188.0 cm
5'9.7" - 6'2.0"
83.0 - 88.0 cm
32.7" - 34.6"
XL
186.0 - 196.0 cm
6'1.2" - 6'5.2"
87.0 - 92.0 cm
34.3" - 36.2"
2XL
195.0 - 203.0 cm
6'4.8" - 6'7.9"
92.0 - 95.0 cm
36.2" - 37.4"
All measurements provided in cm unless otherwise stated.
| Frame size number | Frame size letter | Wheel size | A — Seat tube | B — Seat tube angle | Effective 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 13.5 | XS | 27.5" | 34.3 | 73.5° | 73.5° | 9.0 | 69.3° | 54.4 | 29.2 | 5.8 | 42.5 | 4.2 | 8.8 | 103.6 | 69.8 | 37.6 | 56.5 |
| 15.5 | S | 27.5" | 36.8 | 73.5° | 73.5° | 9.0 | 69.3° | 55.5 | 30.2 | 4.8 | 42.5 | 4.2 | 8.8 | 105.3 | 72.4 | 38.5 | 57.4 |
| 17.5 | M | 29" | 41.9 | 71.9° | 73.0° | 9.0 | 69.5° | 60.1 | 31.1 | 5.8 | 43.8 | 4.2 | 9.4 | 110.9 | 74.8 | 41.8 | 59.8 |
| 18.5 | ML | 29" | 44.4 | 71.9° | 73.0° | 9.0 | 69.5° | 61.7 | 31.0 | 5.8 | 43.8 | 4.2 | 9.4 | 112.5 | 75.7 | 43.4 | 59.8 |
| 19.5 | L | 29" | 47.0 | 71.9° | 73.0° | 10.0 | 69.5° | 63.7 | 31.0 | 5.8 | 43.8 | 4.2 | 9.4 | 114.5 | 75.7 | 45.1 | 60.8 |
| 21.5 | XL | 29" | 52.1 | 71.9° | 73.0° | 12.0 | 69.5° | 65.8 | 31.0 | 5.8 | 43.8 | 4.2 | 9.4 | 116.7 | 76.8 | 46.6 | 62.7 |
| 23.0 | XXL | 29" | 55.9 | 71.9° | 73.0° | 12.0 | 69.5° | 67.2 | 31.1 | 5.8 | 43.8 | 4.2 | 9.4 | 118.1 | 80.4 | 48.0 | 62.7 |