It's right for you if...
You want your fat bike to feel like your traditional mountain bike. Or, you're riding a fat bike year-round and want to put your money into the parts that really matter, like a workhorse drive train and a quality suspension fork.
The tech you get
A lightweight aluminium frame with horizontal sliding dropouts, an 80 mm Manitou Mastodon suspension fork with an air spring and lockout feature, a dropper post for getting low, a wide-range SRAM NX/SX Eagle 1x12 drivetrain, SUNringlé Mulefüt wheels paired with a 108T Rapid Drive hub for instant engagement and extra-grippy, studdable Bontrager Gnarwhal TLR tyres.
The final word
This fat bike handles like a traditional trail bike, and it can rip through even crazier stuff, like snow and sand. You're getting a great frame and solid parts group, but you're really paying for the incredible capability of the Manitou Mastodon fork.
favorite_borderWhy you'll love it
- If you thought that fat bikes were sluggish, this one will change your mind
- The combination of the Manitou Mastodon fork and wide, beefy tyres make it easy to charge through snowy trails and rock gardens alike
- It's a four-season freedom machine that lets you ride outside all-year long
- Horizontal sliding dropouts lets you fine-tune your geometry – run it long for stability or shorter for nimbler handling
- The dropper post lets you lower your saddle on the fly so it's out of the way on descents
27.5˝ fat tyres
More efficient 27.5" fat tyres keep you rolling faster, especially on groomed or packed snow.
Rapid Drive 108 rear hub
With 108 points of engagement, Rapid Drive gives you nearly instant acceleration instead of a clunky lag when you step on the pedals. You get smooth, immediate power to blast out of corners and hammer through the rough stuff. And that extra pedal ratchet adds control that can make all the difference when tackling a tricky climb.
Use the remote lever to lower your saddle so it's out of your way when you're descending and cornering.
Locked suspension means your fork remains inactive, increasing pedalling efficiency. Perfect for extended road sections where efficiency is more important than bump absorption.
Alpha Platinum Aluminium
Our premium lightweight aluminium is continuously cold extruded and butted at multiple points, and hydroformed into sophisticated tube shapes for maximum strength and minimum weight.
*spec applies to all sizes unless otherwise noted
|Frame||Alpha Platinum Aluminium, tapered head tube, internal derailleur & dropper post routing, rack mounts, 197x12 mm adjustable horizontal sliding dropouts|
|Fork||Manitou Mastodon 34 Comp, air spring, ABS damper, lockout, tapered steerer, 51 mm offset, 150x15 mm thru axle, 80 mm travel|
|Max compatible fork travel||100mm (513mm axle-to-crown)|
|Hub front||Bontrager alloy, sealed bearing, 6-bolt disc, 150x15 mm thru axle|
|Hub rear||Bontrager alloy, sealed bearing, 6-bolt, 108T Rapid Drive, Shimano 10 freehub, 197x12 mm thru axle|
|Skewer rear||Bontrager Switch thru-axle, removable lever|
|Rim||SUNRingle Mulefut 80 SL, 32-hole cutout|
|Spokes||15 g stainless steel|
S, M, L, XL
Bontrager Gnarwhal Team Issue, Tubeless Ready, Inner Strength sidewalls, studdable, aramid bead, 120 tpi, 27.5x4.50'"'
Bontrager Gnarwhal Team Issue, Tubeless Ready, Inner Strength sidewalls, studdable, aramid bead, 120 tpi, 27.5x3.80'"'
|Max tyre size||27.5x4.50" or 26x4.70"|
|Shifter||SRAM SX Eagle, 12-speed|
|Rear derailleur||SRAM NX Eagle|
SRAM X1 1000 Eagle, DUB, 30T alloy FAT 5 ring, 170 mm length
M, L, XL
SRAM X1 1000 Eagle, DUB, 30T alloy FAT 5 ring, 175 mm length
|Bottom bracket||SRAM DUB, 121 mm, PressFit|
|Cassette||SRAM PG-1210 Eagle, 11-50, 12-speed|
|Chain||SRAM SX Eagle, 12-speed|
|Pedal||VP-536 nylon platform|
|Max. chainring size||1x: 32T, 2x: 22/36|
|Saddle||Bontrager Arvada, steel rails, 138 mm width|
TranzX JD-YSP18, 100 mm travel, internal routing, 31.6 mm, 361 mm length
M, L, XL
TranzX JD-YSP18, 130mm travel, internal routing, 31.6 mm, 425 mm length
|Handlebar||Bontrager alloy, 31.8 mm, 15 mm rise, 750 mm width|
|Grips||Bontrager XR Trail Comp, nylon lock-on|
Bontrager Elite, 31.8 mm, Blendr-compatible, 7-degree, 60 mm length
Bontrager Elite, 31.8 mm, Blendr-compatible, 7-degree, 70 mm length
Bontrager Elite, 31.8 mm, Blendr-compatible, 7-degree, 80 mm length
Bontrager Elite, 31.8 mm, Blendr-compatible, 7-degree, 90 mm length
|Head set||FSA IS-2, 1-1/8" top, 1.5" bottom|
|Brake||SRAM Level T hydraulic disc|
S, M, L, XL
Avid G2 Cleansweep, 180 mm, 6-bolt
S, M, L, XL
Avid G2 CleanSweep, 6-bolt, 160 mm
|Rotor size||SRAM Level T hydraulic disc|
|Weight||M - 16.25 kg/35.82 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.
153.0 - 166.5 cm
5'0.2" - 5'5.6"
72.0 - 79.0 cm
28.3" - 31.1"
161.0 - 175.0 cm
5'3.4" - 5'8.9"
76.0 - 82.0 cm
29.9" - 32.3"
174.0 - 188.0 cm
5'8.5" - 6'2.0"
82.0 - 88.0 cm
32.3" - 34.6"
186.0 - 196.0 cm
6'1.2" - 6'5.2"
87.0 - 92.0 cm
34.3" - 36.2"
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 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|