Trek Marlin 7


Upgrades from Marlin 6

  • RockShox 30 fork
  • Shimano M351 crank
  • Shimano Altus/Acera 3×9 drivetrain
  • Bontrager Evoke 1.5 saddle

2018 Trek Marlin 7

Mountain Adventure Awaits

Marlin takes its cue from light, fast XC bikes. The right wheel size for each frame size, performance pedigree and an unbeatable ride feel make Marlin the perfect trail rider.

When you’re ready for longer days on the bike, bigger challenges on the trail and all the fun of the full mountain biking experience, you’re ready for Marlin.

XL light, mountain tough

Hydroformed Alpha Aluminium frame is race light, mountain strong, and ride tuned for peak performance.

Perfect fit

Extended size range includes the small 13.5″, the additional mid-range 18.5″, and the extra-large 23″ to better fit more riders.

Premium spec

Full Shimano drivetrains, including cranks, plus reliable Tektro brakes gives these bikes the performance edge over the competition.

Smart Wheel Size

One wheel size does not fit all. We put the right size wheel on every frame: 27.5” on 13.5” and 15.5” frames, 29er on 17.5” and up. Everyone wins.

Marlin: Mountain Adventure Awaits

  • Alpha Aluminium

    Alpha Silver Aluminium

    Trek’s proprietary lightweight aluminium is continuously cold extruded to a single-wall thickness for durable performance.

  • G2 Geometry

    G2 Geometry

    Advanced frame geometry and a custom offset fork give our 29ers precise handling at low speed without compromising high-speed stability. We call it G2 Geometry, and it’s why our 29ers handle better than anyone else’s.

  • Smart Wheel Size

    Smart Wheel Size

    The right wheel size paired with your frame size gives you the perfect combination of responsiveness and control.

  • Mountain Bike Rack Mounts

    Rack mounts

    Going for a long ride? Rack mounts make carrying accessories a breeze.


    Alpha Silver Aluminium w/semi-integrated head tube, rack and mudguard mounts, G2 Geometry on 29ers
    Front suspension
    RockShox 30, coil spring, preload, TurnKey lockout, G2 Geometry w/51mm offset on 29ers, 100mm travel (13.5: 80mm travel)

    Formula alloy hubs, Bontrager Connection 32-hole double-walled rims
    Front Hub
    Formula DC20 alloy
    Rear Hub
    Formula DC22 alloy
    Bontrager Connection 32-hole double-walled
    Bontrager 14g
    Bontrager XR2, 29×2.20″ front, 29×2.00″ rear (13.5 & 15.5: 27.5×2.20″)

    Shimano Altus M370, 9-speed
    Front derailleur
    Shimano Altus
    Rear derailleur
    Shimano Acera M3000, Shadow
    Shimano M351, 44/32/22
    Bottom bracket
    Sealed cartridge
    Shimano HG20, 11-34, 9-speed
    KMC X9
    Wellgo nylon platform

    Bontrager Evoke 1.5
    Bontrager SSR, 2-bolt head, 27.2mm, 12mm offset
    Bontrager alloy, 31.8mm, 15mm rise
    Bontrager Alloy, 31.8mm, 7mm rise, Blendr compatible
    Bontrager Race
    Head set
    1-1/8″ threadless, semi-integrated, semi-cartridge bearings
    Brake set
    Tektro M285 hydraulic disc

Sizing & Fitting

Proper bike fit is essential for best performance and comfort. Any size and geometry measurements shown are for general comparison purposes only. To find your perfect fit, visit us in store, where an expert skilled at sizing will help you find the appropriate bike and size for your individual needs.

Trek Mountain Bike Geometry

All measurements have been provided in cm unless otherwise indicated.

Frame size numberActual frame sizeWheel sizeASeat tubeBSeat tube angleEffective seat tube angleCHead tube lengthDHead angleEEffective top tubeFBottom bracket heightGBottom bracket dropHChainstay lengthIOffsetJTrailKWheelbaseLStandoverMFrame reachNFrame stack
13.5 in13.5 in27.5″34.373.0°73.0°10.069.0°52.530.64.843.84.48.9103.366.035.256.5
15.5 in15.5 in27.5″39.473.0°73.0°10.069.3°
17.5 in16.5 in29″41.972.5°72.5°10.069.3°
18.5 in17.5 in29″44.472.3°72.3°10.069.6°
19.5 in18.5 in29″47.072.0°72.0°10.069.6°63.931.65.344.55.18.3114.478.944.460.1
21.5 in20.5 in29″52.172.0°72.0°12.069.6°65.931.65.344.55.18.3116.582.545.862.0
23 in22 in29″55.972.0°72.0°12.069.6°67.331.65.344.55.18.3117.984.847.262.0


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