Trek Roscoe 8 (Gen 4) Trail Mountain Bike 2026

Roscoe 8 is a rowdy hardtail built to hunt for side hits and dive into the steep stuff . Its Alpha Gold Aluminum frame pairs with a Fox Rhythm 36 fork (150mm travel) to soak up rough and chunky trail debris. It delivers plenty of gears for punchy climbs, thanks to a 12-speed Shimano Deore drivetrain, and stop-on-a-dime braking power from 4-piston Shimano M6100 hydraulic disc brakes.

SPECIFICATIONS

*Please note - spec applies to all sizes unless listed separately

Frameset
Frame    Alpha Platinum Aluminum, tapered head tube, ZS headset, internal derailleur & dropper post routing, ISCG 05, threaded BB, UDH, 148x12mm thru axle
*Fork    Size: S
Fox Rhythm 36, Float EVOL air spring, GRIP damper, tapered steerer, 44mm offset, Boost110, 15mm Kabolt axle, 150mm travel
Size: M, ML, L, XL
Fox Rhythm 36, Float EVOL air spring, GRIP damper, tapered steerer, 44mm offset, Boost110, 15mm Kabolt X axle, 150mm travel
Max compatible fork travel    160mm

Wheels
Hub front    Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Boost110, 15 mm thru axle
Hub rear    Bontrager alloy, sealed bearing, 6-bolt, Rapid Drive 108, Shimano freehub, Boost148, 12mm thru axle
Skewer rear    Bontrager Switch thru axle, removable lever
Rim    Bontrager Line TLR 30, Tubeless Ready, 28-hole, Presta valve
*Tire    Size: S
Bontrager Brevard Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi, 27.5x2.50"
Size: M, ML, L, XL
Bontrager Brevard Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi, 29x2.50"
Tire part    Bontrager TLR sealant, 180 ml/6 oz
Rim strip    Bontrager TLR
Max tire size    Frame: 29x2.60", Fork: See manufacturer

Drivetrain
Shifter    Shimano Deore M6100, 12 speed
Rear derailleur    Shimano Deore M6100, long cage
Crank    Shimano MT512, 30T ring, 55mm chainline, 170mm length
Bottom bracket    Shimano BB-MT501 BSA
Cassette    Shimano Deore M6100, 10-51, 12 speed
Chain    Shimano Deore M6100, 12 speed
Max chainring size    1x: 34T, min 28T

Components
Saddle    Bontrager Verse P3, steel rails
*Seatpost    Size: S
TranzX JD-YSI34, 150mm travel, internal routing, 31.6mm, 456mm length
Size: M, ML
TranzX JD-YSI34, 170mm travel, internal routing, 31.6mm, 500mm length
Size: L, XL
TranzX JD-YSI34, 200mm travel, internal routing, 31.6mm, 565mm length
*Handlebar    Size: S
Bontrager alloy, 31.8mm, 15mm rise, 750mm width
Size: M, ML, L, XL
Bontrager Comp, alloy, 31.8mm, 40mm rise, 780mm width
Grips    Trek Line Comp, nylon lock-on
*Stem    Size: S
Bontrager Comp, 31.8mm, 7 degree, 35mm length
Size: M, ML, L, XL
Bontrager Comp, 31.8mm, Blendr compatible, 7 degree, 50mm length
Headset    FSA Orbit, sealed cartridge bearing, 1-1/8'' top, 1.5'' bottom, 1.5 crown
Brake    Shimano M6120 4-piston hydraulic disc
*Brake rotor    Size: S, M, ML, L, XL
Shimano RT66, 6-bolt, 180mm
Size: S, M, ML, L, XL
Shimano RT66, 6-bolt, 203mm
Rotor size    Max brake rotor sizes - Frame: 203mm, min 180mm, Fork: see fork manufacturer

Weight
Weight    M - 14.18 kg / 31.27 lbs (with TLR sealant, no 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, materials, and pricing. Due to supply chain issues, compatible parts may be substituted at any time without notice.

Bike and frame weights are based off pre-production painted frames at time of publication. Weights may vary in final production.