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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 drivetrain and a quality suspension fork.

The tech you get

A lightweight aluminum frame with horizontal sliding dropouts, an 80mm 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 tires.

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

  1. If you thought that fat bikes were sluggish, this one will change your mind
  2. The combination of the Manitou Mastodon fork and wide, beefy tires make it easy to charge through snowy trails and rock gardens alike
  3. It's a four-season freedom machine that lets you ride outside all year long
  4. Horizontal sliding dropouts lets you fine-tune your geometry—run it long for stability, or shorter for more nimbler handling
  5. The dropper post lets you lower your saddle on the fly so it's out of the way on descents

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Features

27.5˝ fat tires

27.5˝ fat tires

More efficient 27.5" fat tires keep you rolling faster, especially on groomed or packed snow.

Rapid Drive 108 rear hub

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.

Specifications

*spec applies to all sizes unless otherwise noted

Frameset
Frame Alpha Platinum Aluminum, tapered head tube, internal derailleur & dropper post routing, rack mounts, 197x12mm adjustable horizontal sliding dropouts
Fork Manitou Mastodon 34 Comp, air spring, ABS damper, lockout, tapered steerer, 51mm offset, 150x15mm thru axle, 80mm travel
Max compatible fork travel 120mm
Wheels
Front hub Bontrager alloy, sealed bearing, 6-bolt, 15x150mm thru axle
Rear hub Bontrager alloy, sealed bearing, 6-bolt, 108T Rapid Drive, Shimano 10 freehub, 197x12mm thru axle
Rim SUNRingle Mulefut 80 SL, 32-hole cutout
Spokes 15g, stainless
*Tire Size: S, M, L, XL
Bontrager Gnarwhal Team Issue, Tubeless Ready, Inner Strength sidewalls, studdable, aramid bead, 120 tpi, 27.5x4.50''
Size: S, M
Bontrager Gnarwhal Team Issue, Tubeless Ready, Inner Strength sidewalls, studdable, aramid bead, 120 tpi, 27.5x3.80''
Max tire size 27.5x4.50" or 26x4.70"
Drivetrain
Shifter SRAM SX Eagle, 12 speed
Rear derailleur SRAM NX Eagle
*Crank Size: S
SRAM X1 1000 Eagle, DUB, 30T alloy FAT 5 ring, 170mm length
Size: M, L, XL
SRAM X1 1000 Eagle, DUB, 30T alloy FAT 5 ring, 175mm length
Bottom bracket SRAM DUB, 121mm, 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
Components
Saddle Bontrager Arvada, steel rails, 138mm width
*Seatpost Size: S
TranzX JD-YSP18, 100mm travel, internal routing, 31.6mm, 361mm length
Size: M, L, XL
TranzX JD-YSP18, 130mm travel, internal routing, 31.6mm, 425mm length
Handlebar Bontrager alloy, 31.8mm, 15mm rise, 750mm width
Grips Bontrager XR Trail Comp, nylon lock-on
*Stem Size: S
Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 60mm length
Size: M
Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 70mm length
Size: L
Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 80mm length
Size: XL
Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 90mm length
Headset FSA IS-2, 1-1/8'' top, 1.5'' bottom
Brake SRAM Level T hydraulic disc
*Brake rotor Size: S, M, L, XL
Avid G2 Cleansweep, 180mm, 6-bolt
Size: S, M, L, XL
Avid G2 Cleansweep, 160mm, 6-bolt
Rotor size SRAM Level T hydraulic disc
Weight
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 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, and materials.
Bike and frame weights are based off Trek pre-production painted frames at time of publication. Weights may vary in final production.

Sizing & fit

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 Trek retailer.

 

Rider Height

Inseam

All measurements provided in cm unless otherwise noted.

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 Stem length
S 27.5" 39.4 71.5° 73.0° 10.0 69.0° 56.7 31.3 6.7 45.5 5.1 9.4 109.2 72.9 38.3 60.1 7.0
M 27.5" 41.9 71.5° 73.0° 10.0 69.0° 59.4 31.3 6.7 45.5 5.1 9.4 111.9 73.9 41 60.1 8.0
L 27.5" 47.0 71.5° 73.0° 12.0 69.0° 63.1 32.1 6.7 45.5 5.1 9.4 115.8 78.6 44.1 61.9 8.0
XL 27.5" 52.1 71.5° 73.0° 12.0 69.0° 64.4 32.1 6.7 45.5 5.1 9.4 117.1 81.7 45.4 61.9 8.0

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