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.
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.
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.
- 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
-
if (typeof dataLayer !== "undefined") {
dataLayer.push({
"ecommerce": {
"currency": "",
"impressions": [
{
"id": "31564",
"name": "Bontrager Rally WaveCel Mountain Bike Helmet",
"price": "",
"brand": "Bontrager",
"category": "Bike helmets",
"list": "",
"position": 1
}
,
{
"id": "33190",
"name": "Bontrager Enduro Front Fender",
"price": "",
"brand": "Bontrager",
"category": "Bike fenders & accessories",
"list": "",
"position": 2
}
,
{
"id": "35886",
"name": "Bontrager Right Side Load Recycled Water Bottle Cage",
"price": "",
"brand": "Bontrager",
"category": "Bike water bottles & cages",
"list": "",
"position": 3
}
,
{
"id": "22798",
"name": "Bontrager Evoke Women's Mountain Bike Short",
"price": "",
"brand": "Bontrager",
"category": "Mountain bike shorts & bib shorts",
"list": "",
"position": 4
}
,
{
"id": "40409",
"name": "Fox Racing Ranger Mountain Bike Short with Liner",
"price": "",
"brand": "Fox Racing",
"category": "Mountain bike shorts & bib shorts",
"list": "",
"position": 5
}
,
{
"id": "22788",
"name": "Bontrager Evoke Mountain Bike Tech Tee",
"price": "",
"brand": "Bontrager",
"category": "Mountain bike jerseys",
"list": "",
"position": 6
}
,
{
"id": "14798",
"name": "Bontrager Rapid Pack",
"price": "",
"brand": "Bontrager",
"category": "Bike bags & panniers",
"list": "",
"position": 7
}
,
{
"id": "22824",
"name": "Bontrager Evoke Mountain Bike Glove",
"price": "",
"brand": "Bontrager",
"category": "Full finger cycling gloves",
"list": "",
"position": 8
}
,
{
"id": "22797",
"name": "Bontrager Evoke Women's Mountain Bike Tech Tee",
"price": "",
"brand": "Bontrager",
"category": "Mountain bike jerseys",
"list": "",
"position": 9
}
,
{
"id": "27194",
"name": "Bontrager Quantum Women's Full Finger Cycling Glove",
"price": "",
"brand": "Bontrager",
"category": "Full finger cycling gloves",
"list": "",
"position": 10
}
]
}
});
}
The Alpha Gold Aluminum 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 out back.
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.
The right wheel size paired with your frame size gives you the perfect combination of responsiveness and control.
Locked suspension means your fork remains inactive, increasing pedaling efficiency. Perfect for extended road sections where efficiency is more important than bump absorption.
We route shift and brake cables through the frame to keep things clean and simple. And it looks great, too.
Bontrager Blendr stem technology lets you clip your gear directly to the stem for clean looks, maximum user friendliness.
Learn more
Going for a long ride? Rack mounts make carrying accessories a breeze.
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 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.
*spec applies to all sizes unless otherwise noted
| Frame |
Alpha Gold Aluminum, tapered head tube, internal derailleur & dropper post routing, rack & kickstand mount, Boost141, 5mm QR |
| *Fork |
Size:
XS
RockShox Judy SL, Solo Air spring, TurnKey lockout, tapered steerer, 42mm offset, Boost110, 15mm Maxle Lite, 80mm travel |
Size:
S
RockShox Judy SL, Solo Air spring, TurnKey lockout, tapered steerer, Boost110, 15mm Maxle Lite, 100mm travel |
Size:
M, M/L, L, XL, XXL
RockShox Judy SL, Solo Air spring, TurnKey lockout, tapered steerer, Boost110, 15mm Maxle Stealth, 100mm travel |
| Max compatible fork travel |
120mm (XS: 100mm) |
| Hub front |
Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Boost110, 15mm thru axle |
| Hub rear |
Bontrager alloy, sealed bearing, 6-bolt, Shimano MicroSpline freehub, Boost141, 5mm QR |
| *Rim |
Size:
XS, S, M, M/L, L, XL, XXL
Bontrager Kovee, double-wall, Tubeless Ready, 28-hole, 23mm width, presta valve |
Size:
XS, S, M, M/L, L, XL, XXL
Bontrager Kovee, double-wall, Tubeless Ready, 32-hole, 23mm width, presta valve |
| Spokes |
14g stainless steel |
| *Tire |
Size:
XS, S
Maxxis Ardent Race, tubeless, EXO casing, folding bead, 60tpi, 27.5x2.35'' |
Size:
M, M/L, L, XL, XXL
Maxxis Ardent Race, tubeless, EXO casing, folding bead, 60tpi, 29x2.35'' |
| Tire part |
Bontrager TLR sealant, 6oz |
| Rim strip |
Bontrager TLR
|
| Max tire size |
Frame: 27.5x2.80" or 29x2.40" Fork: See manufacturer |
| Shifter |
Shimano Deore M6100, 12 speed |
| Rear derailleur |
Shimano XT M8100, long cage |
| *Crank |
Size:
XS, S, M
Shimano MT511, 30T steel ring, 52mm chainline, 170mm length |
Size:
M/L, L, XL, XXL
Shimano MT511, 30T steel ring, 52mm chainline, 175mm length |
| Bottom bracket |
Shimano SM-BB52, 73mm, threaded external bearing |
| Cassette |
Shimano Deore M6100, 10-51, 12 speed |
| Chain |
Shimano Deore M6100, 12 speed |
| Pedal |
VP-536 nylon platform
|
| Max chainring size |
32T |
| Saddle |
Bontrager Arvada, steel rails, 138mm width |
| *Seatpost |
Size:
XS, S
Bontrager alloy, 31.6mm, 12mm offset, 330mm length |
Size:
M
Bontrager alloy, 31.6mm, 12mm offset, 360mm length |
Size:
M/L, L, XL, XXL
Bontrager alloy, 31.6mm, 12mm offset, 400mm length |
| *Handlebar |
Size:
XS
Bontrager alloy, 31.8mm, 5mm rise, 690mm width |
Size:
S, M
Bontrager alloy, 31.8mm, 5mm rise, 720mm width |
Size:
M/L, L, XL, XXL
Bontrager alloy, 31.8mm, 15mm rise, 750mm width |
| Grips |
Bontrager XR Trail Comp, nylon lock-on
|
| *Stem |
Size:
XS, S
Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 60mm length
|
Size:
M, M/L
Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 70mm length
|
Size:
L
Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 80mm length
|
Size:
XL, XXL
Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 90mm length
|
| Headset |
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,160mm |
Size:
L, XL, XXL
Shimano RT26, 6-bolt,180mm |
| Brake Set |
Shimano MT200 hydraulic disc |
| Weight |
M - 13.05 kg / 28.78 lbs |
| Weight limit |
This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg). |
We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colors, materials, and pricing. Prices shown are manufacturer's suggested retail prices.
Bike and frame weights are based off pre-production painted frames at time of publication. Weights may vary in final production.
The charts below show our recommended sizes based on height, but there are some other factors, like arm and leg length, that determine a great fit. That’s why you’ll see some overlap in our recommendations. Not every rider who’s 5´8˝, for example, will fit on the same size bike. The best way to find your perfect fit is to consult the experts at your local retailer.
All measurements provided in cm unless otherwise noted.
| 13.5" |
XS |
27.5" |
34.3 |
73.5° |
73.5° |
9 |
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 |
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 |
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 |
69.5° |
61.7 |
31 |
5.8 |
43.8 |
4.2 |
9.4 |
112.5 |
75.7 |
43.4 |
59.8 |
| 19.5" |
L |
29" |
47 |
71.9° |
73.0° |
10 |
69.5° |
63.7 |
31 |
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 |
69.5° |
65.8 |
31 |
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 |
69.5° |
67.2 |
31.1 |
5.8 |
43.8 |
4.2 |
9.4 |
118.1 |
80.4 |
48 |
62.7 |
var pr_merchant_user_id = "";
var pr_merchant_user_email = "";
var pr_api_key = "87b3f2f0-f542-43f9-bf33-10c41cffcb73";
var pr_locale = "en_US";
var pr_merchant_group_id = "10250";
var pr_merchant_id = "4404";
var pr_page_id = "2020_28064";
if (pr_page_id === undefined || pr_page_id === null || pr_page_id.trim() === "") {
// default to sku if poerreviewid is null
pr_page_id = "35069";
}
var pr_write_review = "/us/en_US/bikes/mountain-bikes/cross-country-mountain-bikes/x-caliber/x-caliber-8/p/35069/writeReview?";
var pr_product_name = "X-Caliber 8";
var pr_product_url = "https://www.trekbikes.com/p/" + "35069" + "/";
var pr_product_image = "//trek.scene7.com/is/image/TrekBicycleProducts/XCaliber8_22_35069_A_Primary?wid=690&hei=518&fmt=png8-alpha&qlt=80,1&op_usm=0,0,0,0&iccEmbed=0&cache=on,on";
if (pr_product_image && !pr_product_image.startsWith("http")) {
pr_product_image = "https:" + pr_product_image;
}
var pr_product_description = pr_product_name;
var pr_product_category_name = "Cross Country mountain bikes";
var pr_product_manufacturer_id = "35069";
var pr_product_upc = "601842581841";
var pr_product_brand_name = "Trek";
var pr_product_price = "";
var pr_product_in_stock = "";
window.pwr = window.pwr || function () {
(pwr.q = pwr.q || []).push(arguments);
};
