Trek Marlin 4 (Gen 3) Hardtail Mountain Bike 2026

Marlin 4 is a trail-worthy daily rider that's perfectly suited for everyday adventures, on and off the trail. It features a trail-savvy frame with a suspension fork, 8-speed Shimano ESSA shifting, and mounts for a rack and kickstand that make it an ideal choice for trail riders or anyone looking for a comfortable, stable commuter with the ruggedness of a real mountain bike.

SPECIFICATIONS

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

Frameset
*Frame    Size: XXS , XS
Alpha Silver Aluminum, curved top tube, internal derailleur & dropper post routing, rack and kickstand mount, 135x5mm ThruSkew
Size: S , M , ML , L , XL
Alpha Silver Aluminum, internal derailleur & dropper post routing, rack and kickstand mount, 135x5mm ThruSkew
*Fork    Size: XXS
SR Suntour XCM 30, coil spring, preload, hydraulic lockout, 42mm offset for 26" wheel, 100mm QR, 100mm travel
Size: XS
SR Suntour XCE 28, coil spring, preload, 42mm offset for 27.5'' wheel, 100mm QR, 80mm travel
Size: S
SR Suntour XCE 28, coil spring, preload, 42mm offset for 27.5'' wheel, 100mm QR, 100mm travel
Size: M , ML , L , XL
SR Suntour XCE 28, coil spring, preload, 46mm offset for 29'' wheel, 100mm QR, 100mm travel

Wheels
Hub front    Formula DC-20, alloy, 6-bolt, 5x100 mm QR
Hub rear    Formula DC-22, alloy, 6-bolt, Shimano 8/9/10 freehub, 135x5 mm QR
Skewer rear    173x5mm QR
Rim    Bontrager Connection, double-wall, 32-hole, 20mm width, schrader valve
*Tire    Size: XXS
Bontrager Montrose Comp, wire bead, 30 tpi, 26x2.35''
Size: XS , S
Bontrager Montrose comp, wire bead, 30 tpi, 27.5x2.40"
Size: M , ML , L , XL
Bontrager Montrose comp, wire bead, 30 tpi, 29x2.40"

Drivetrain
Shifter    Shimano M315, 8 speed
Rear derailleur    Shimano ESSA U2000
*Crank    Size: XXS , XS
ProWheel alloy, 32T narrow-wide steel ring, 160mm length
Size: S , M , ML
ProWheel alloy, 32T narrow-wide steel ring, 170mm length
Size: L , XL
ProWheel alloy, 32T narrow-wide steel ring, 175mm length
Cassette    Shimano HG300, 11-45, 8 speed
Chain    KMC Z8.3, 8 speed
Pedal    nylon platform

Components
Saddle    Bontrager Verse Short, stainless steel rails
*Seatpost    Size: XXS
Bontrager alloy, 31.6 mm, 12 mm offset, 300 mm length
Size: XS , S , M
Bontrager alloy, 31.6mm, 12mm offset, 330mm length
Size: ML , L , XL
Bontrager alloy, 31.6mm, 12mm offset, 400mm length
*Handlebar    Size: XXS , XS
Bontrager alloy, 31.8mm, 5mm rise, 690mm width
Size: S
Bontrager alloy, 31.8mm, 15mm rise, 720mm width
Size: M , ML , L , XL
Bontrager alloy, 31.8mm, 15mm rise, 750mm width
Grips    Trek Line Comp, nylon lock-on
*Stem    Size: XXS , XS , S
Bontrager Comp, 31.8mm, 7 degree, 35mm length
Size: M , ML , L
Bontrager Comp, 31.8mm, Blendr compatible, 7 degree, 50mm length
Size: XL
Bontrager Comp, 31.8mm, Blendr compatible, 7 degree, 60mm length
Headset    Semi-integrated, 1-1/8''
*Brake    Size: XXS , XS , S
Tektro HD-M276 hydraulic disc
Size: M , ML , L , XL
Tektro HD-M275 hydraulic disc
*Brake rotor    Size: XXS , XS , S , M , ML , L , XL
Tektro, 6-bolt, 160mm
Size: M , ML , L , XL
Tektro, 6-bolt, 180mm

Weight
Weight    M - 14.90 kg / 32.85 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. 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.