Trek Marlin 4 – A Reliable Everyday Mountain Bike for Urban and Off-Road Adventures

Trek Marlin 4 is a versatile everyday bike built to handle both paved roads and light trails with ease. With its trail-ready geometry, front suspension, Shimano ESSA 8-speed drivetrain, and integrated mounting points for racks and kickstands, it offers the look and stability of a real mountain bike at an accessible price point.

🚴‍♂️ Perfect for you if...

You're looking for a rugged and reliable bike that can handle your daily commutes, weekend rides, and occasional off-road excursions. You want the confidence of mountain bike design combined with the utility of a commuter.

⚙️ What you get

• Frame: Lightweight Alpha Silver aluminum frame with trail-inspired geometry, internal cable routing, and mounts for rack and kickstand

• Suspension Fork: 100mm travel suspension fork smooths out bumps, curbs, and gravel paths

• Drivetrain: Simple and durable Shimano ESSA 8-speed shifting — perfect for new riders

• Brakes: Mechanical disc brakes for solid stopping power and easy maintenance

• Wheels & Tires: 27.5” or 29” wheels (based on frame size) with versatile tires that roll well on both pavement and trail

• Accessory Mounts: Built-in rack and kickstand mounts let you easily convert it into a utility-ready ride

Why you’ll love it

 A great entry-level mountain bike that looks and rides like the real thing
Trail-friendly geometry gives you control and comfort on every surface
 Easy to accessorize with rack, fenders, or kickstand — ready for daily errands or weekend fun
Straightforward Shimano drivetrain with wide-range gearing for varied terrain
Affordable without sacrificing Trek’s signature durability and smart design

Frame

• Size XS
  Alpha Silver aluminum, curved top tube, internal cable routing for rear derailleur and dropper post, rack and kickstand mounts, ThruSkew 135x5mm

• Sizes ML, M, L, S, XL, XXL
  Alpha Silver aluminum, internal cable routing for rear derailleur and dropper post, rack and kickstand mounts, ThruSkew 135x5mm

Fork

• Size XS
  SR Suntour XC 28, coil spring, preload, 42mm offset for 27.5" wheel, 100mm QR, 80mm travel

• Size S
  SR Suntour XC 28, coil spring, preload, 42mm offset for 27.5" wheel, 100mm QR, 100mm travel

• Sizes ML, M, L, XL, XXL
  SR Suntour XC 28, coil spring, preload, 46mm offset for 29" wheel, 100mm QR, 100mm travel

Wheels

• Front Hub (all sizes)
  Formula DC-20, alloy, 6 bolts, 5x100mm QR

• Rear Hub (all sizes)
  Formula DC-22, alloy, 6 bolts, Shimano 8/9/10 freewheel, 135x5mm QR

• Rear Skewer (all sizes)
  QR 173x5mm

• Rim (all sizes)
  Bontrager Connection, double wall, 32 holes, 20mm width, Schrader valve

• Tires

  • Sizes XS, S
    Bontrager Montrose Comp, rigid bead, 30tpi, 27.5x2.40"

  • Sizes ML, M, L, XL, XXL
    Bontrager Montrose Comp, rigid bead, 30tpi, 29x2.40"

Drivetrain

• Shifter (all sizes)
  Shimano M315, 8 speed

• Rear Derailleur (all sizes)
  Shimano ESSA U2000

• Crank

  • Size XS
    ProWheel alloy, steel 32T narrow-wide chainring, 160mm length

  • Sizes ML, M, S
    ProWheel alloy, steel 32T narrow-wide chainring, 170mm length

  • Sizes L, XL, XXL
    ProWheel alloy, steel 32T narrow-wide chainring, 175mm length

• Cassette (all sizes)
  Shimano HG300, 11-45, 8 speed

• Chain (all sizes)
  KMC Z8.3, 8 speed

• Pedals (all sizes)
  Nylon platform

Components

• Saddle (all sizes)
  Bontrager Verse Short, stainless steel rails

• Seatpost

  • Sizes M, XS, S
    Bontrager alloy, 31.6mm, 12mm offset, 330mm length

  • Sizes ML, L, XL, XXL
    Bontrager alloy, 31.6mm, 12mm offset, 400mm length

• Handlebar

  • Size XS
    Bontrager alloy, 31.8mm, 5mm rise, 690mm width

  • Size S
    Bontrager alloy, 31.8mm, 15mm rise, 720mm width

  • Sizes ML, M, L, XL, XXL
    Bontrager alloy, 31.8mm, 15mm rise, 750mm width

• Grips (all sizes)
  Trek Line Comp, nylon lock-on

• Stem

  • Sizes XS, S
    Bontrager Comp, 31.8mm, 7°, 35mm length

  • Sizes ML, M, L
    Bontrager Comp, 31.8mm, Blendr compatible, 7°, 50mm length

  • Size XL
    Bontrager Comp, 31.8mm, Blendr compatible, 7°, 60mm length

  • Size XXL
    Bontrager Comp, 31.8mm, Blendr compatible, 7°, 70mm length

• Headset (all sizes)
  Semi-integrated, 1-1/8"

• Brake

  • Sizes XS, S
    Tektro HD-M276 hydraulic disc

  • Sizes ML, M, L, XL, XXL
    Tektro HD-M275 hydraulic disc

• Brake Rotor

  • Sizes ML, M, XS, L, S, XL, XXL
    Tektro, 6 bolts, 160mm

  • Sizes ML, M, L, XL, XXL
    Tektro, 6 bolts, 180mm

We reserve the right to make changes to the product information on the website at any time without notice, including details related to equipment, specifications, models, colors, materials, and prices. Due to supply chain issues, compatible parts may be replaced at any time without prior notice.

The listed bicycle and frame weights refer to pre-production painted models at the time of publication. The final product weight may vary.