Trek Marlin 4 Gen 2 2025 (Hex Blue)

Description

The Trek Marlin 4 is the gateway mountain bike that will take you from rail trails to singletrack. It’s ideal for riders who want a mountain bike with knobby tyres that can double as a rugged commuter. Disc brakes, front suspension, Shimano 14-speed shifting and mounts for a rack and mudguards make this a great bike for trail riders and campus commuters alike.

It’s right for you if…

You want an introductory mountain bike at an incredible price, but also want a commuter that’s rugged enough to hop kerbs on the way to class.

The tech you get

A lightweight aluminium frame with internal routing to protect your cables and add to the bike’s sleek look, trustworthy 14-speed Shimano shifting with a wide range of gearing so you always have the right gear for your terrain, powerful hydraulic disc brakes and a suspension fork that takes the edge off bumps and rough terrain.

The final word

The Marlin is made for any adventure. The rack and mudguard mounts make it a great choice for commuters who want to get a little rad on the way to class or the shops.

Why you’ll love it

1. The Marlin Gen 2 is ready to roll with easy to use features that help you get the best bang for your buck
2. Rack and mudguard mounts make it easy to accessorise, so your mountain bike can double as a rugged commuter
3. Smaller frame sizes (XS and S) have short-reach brake levers that make it easier and more comfortable for riders with smaller hands to brake confidently
4. Marlin models in XS and S frame sizes have a curved top tube and a lower standover height that makes it easier for smaller riders to mount and dismount
5. Like every Trek, it’s backed by a lifetime warranty

*Frame

Size: XS , SAlpha Silver Aluminium, curved top tube, internal routing, chainstay disc brake mount, rack and kickstand mount, 135×5 mm QR

Size: M , L , XL , XXLAlpha Silver Aluminium, internal routing, chainstay disc-brake mount, rack and kickstand mount, 135×5 mm QR

*Fork

Size: XSSR Suntour XCE 28, coil spring, preload, 42 mm offset for 27.5″ wheel, 100 mm QR, 80 mm travel

Size: SSR Suntour XCE 28, coil spring, preload, 42 mm offset for 27.5″ wheel, 100 mm QR, 100 mm travel

Size: M , L , XL , XXLSR Suntour XCE 28, coil spring, preload, 46 mm offset for 29″ wheel, 100 mm QR, 100 mm travel

Max compatible fork travel

100 mm (XS and S: 490 mm axle-to-crown, M and up: 509 mm axle-to-crown)

Wheels

Hub front

Formula DC-20, alloy, 6-bolt, 5×100 mm QR

Hub rear

Formula DC-31, alloy, 6-bolt, 6/7/8-speed freewheel, 135×5 mm QR

Skewer rear

152×5 mm QR

Rim

Bontrager Connection, double-wall, 32-hole, 20 mm width, Schrader valve

Spokes

14 g stainless steel, black

*Tyre

Size: XS , SBontrager XR2 Comp, wire bead, 30 tpi, 27.5×2.20″

Size: M , L , XL , XXLBontrager XR2 Comp, wire bead, 30 tpi, 29×2.20″

Max tyre size

Frame: 29×2.20″ (XS & S: 27.5×2.40″), Fork: See manufacturer

Drivetrain

*Shifter

Size: XS , S , M , L , XL , XXLShimano EF500, 2-speed

Size: XS , S , M , L , XL , XXLShimano Altus EF500, 7-speed

Front derailleur

Shimano Altus M315, 34.9 mm clamp, top swing, dual pull

Rear derailleur

Shimano Tourney TY300

*Crank

Size: XS , S , MProWheel TM-CY10, 36/22, 170 mm length

Size: L , XL , XXLProWheel TM-CY10, 36/22, 175 mm length

Bottom bracket

VP BC73, 73 mm, threaded cartridge

Cassette

Shimano TZ500, 14-34, 7-speed

Chain

KMC Z7, 7-speed

Pedal

VP-536 nylon platform

Max. chainring size

1x: See FAQ, 2x: 36T, 3x: 42T

Components

Saddle

Bontrager Verse Short, stainless steel rails

*Seatpost

Size: XS , SBontrager alloy, 31.6 mm, 12 mm offset, 330 mm length

Size: MBontrager alloy, 31.6 mm, 12 mm offset, 360 mm length

Size: L , XL , XXLBontrager alloy, 31.6 mm, 12 mm offset, 400 mm length

*Handlebar

Size: XS , SBontrager alloy, 31.8 mm, 5 mm rise, 690 mm width

Size: M , L , XL , XXLBontrager alloy, 31.8 mm, 15 mm rise, 750 mm width

Grips

Bontrager XR Endurance Comp, lock-on

*Stem

Size: XS , SBontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 50 mm length

Size: MBontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 60 mm length

Size: LBontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 70 mm length

Size: XL , XXLBontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 80 mm length

Head set

Semi-integrated, 1-1/8″

*Brake

Size: XS , S , M , L , XL , XXLTektro MD-M280 mechanical disc

Size: XS , S , M , L , XL , XXLTektro MD-M281 mechanical disc

Size: XS , S , M , L , XL , XXLTektro MD-M280 mechanical disc, 160 mm rotor

Size: XS , S , M , L , XL , XXLTektro MD-M281 mechanical disc, 160 mm rotor

Brake rotor

Tektro wave, 6-bolt, 160 mm

Rotor size

Max brake rotor sizes – Frame: 180mm, min 160mm, Fork: see fork manufacturer

Weight

Weight

M – 14.60 kg / 32.19 lb

Weight limit

This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).

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, colours, materials and pricing. Due to supply chain issues, compatible parts may be substituted at any time without notice.

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