Trek Marlin 5 Gen 3 - 2025

It's right for you if...

You're new to the trail and you’re looking for a real mountain bike that doubles as a commuter – and you want it all at an exceptional value.

The tech you get

A lightweight aluminium frame with internal routing to protect your cables and add to the bike's sleek look, an upgraded 9-speed Shimano CUES drivetrain, a wide range of gearing so you always have the right gear for your terrain, powerful hydraulic disc brakes and a terrain-smoothing suspension fork with a lockout.

The final word

The Marlin 5 is a great ride for all your adventures. It's also versatile and a popular ride on college campuses because the rack and kickstand mounts make it easy to accessorise and haul a load.

Why you'll love it

• The Marlin Gen 3 gives you serious trail capability, with big tyre clearance and slack, confidence-boosting geometry that keeps you stable from singletrack to city
• Mudguard mounts make it easy to accessorise, so your mountain bike can double as a rugged commuter
• Its ThruSkew system is safer, simpler and stronger, plus it makes removing the rear wheel easy for flat fixes in a hurry
• Internal routing makes it easy to add a dropper post that lets you lower your saddle on the fly for more confident descending
• Marlin models in sizes XXS and XS have a curved top tube and lower standover height that makes it easier for smaller riders to mount and dismount

SPECS

FRAMESET

Frame:

- Size: XXS , XS | Alpha Silver Aluminium, curved top tube, internal derailleur and dropper post routing, rack and kickstand mount, 135x5 mm ThruSkew

- Size: S , M , ML , L , XL , XXL | Alpha Silver Aluminium, internal derailleur and dropper post routing, rack and kickstand mount, 135x5 mm ThruSkew

Fork:

- Size: XXS | SR Suntour XCM 30, coil spring, lockout, preload, 100 mm QR, 100 mm travel, 26" wheel

- Size: XS | SR Suntour XCT 30, coil spring, preload, hydraulic lockout, 42 mm offset for 27.5" wheel, 100 mm QR, 80 mm travel

- Size: S | SR Suntour XCT 30, coil spring, preload, hydraulic lockout, 42 mm offset for 27.5" wheel, 100 mm QR, 100 mm travel

- Size: M , ML , L , XL , XXL | SR Suntour XCT 30, coil spring, preload, hydraulic lockout, 46 mm offset for 29" wheel, 100 mm QR, 100 mm travel

Max compatible fork travel: 120mm, XXS: 80mm

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: 173x5 mm QR

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

Spokes: 14 g stainless steel, black

Tyre:

- Size: XXS | Bontrager XT3 Comp, wire bead, 30 tpi, 26x2.35"

- Size: XS , S | Bontrager XT3 Comp, wire bead, 30 tpi, 27.5x2.40"

- Size: M , ML , L , XL , XXL | Bontrager XT3 Comp, wire bead, 30 tpi, 29x2.40"

Max tyre size: Frame: 29x2.40" (XXS: 26x2.40", XS & S: 27.5x2.40"), Fork: See manufacturer

DRIVETRAIN

Shifter: Shimano U4000, 9-speed

Rear derailleur: Shimano CUES U4000

Crank:

- Size: XXS , XS | Prowheel C10Y-NW, 30T steel narrow-wide ring, 160 mm length

- Size: S , M , ML | Prowheel C10Y-NW, 30T steel narrow-wide ring, 170 mm length

- Size: L , XL , XXL | Prowheel C10Y-NW, 30T steel narrow-wide ring, 175 mm length

Cassette: Shimano LINKGLIDE LG300, 11-46, 9-speed

Chain: Shimano LG500

Pedal: VP-536 nylon platform

Max. chainring size: 1x: 34T, 2x: 36/22

COMPONENTS

Seatpost:

- Size: XXS | Bontrager alloy, 31.6 mm, 12 mm offset, 300 mm length

- Size: XS , S , M | Bontrager alloy, 31.6 mm, 12 mm offset, 330 mm length

- Size: ML , L , XL , XXL | Bontrager alloy, 31.6 mm, 12 mm offset, 400 mm length

Handlebar:

- Size: XXS , XS | Bontrager alloy, 31.8 mm, 5 mm rise, 690 mm width

- Size: S | Bontrager alloy, 31.8 mm, 15 mm rise, 720 mm width

- Size: M , ML , L , XL , XXL | Bontrager alloy, 31.8 mm, 15 mm rise, 750 mm width

Grips: Bontrager XR Trail Comp, nylon lock-on

Stem:

- Size: XXS , XS , S | Bontrager Comp, 31.8 mm, 7-degree, 35 mm length

- Size: M , ML , L | Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 50 mm length

- Size: XL | Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 60 mm length

- Size: XXL | Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 70 mm length

Head set: Semi-integrated, 1-1/8"

Brake rotor: Tektro, 6-bolt, 160mm

Brake Set:

- Size: XXS , XS , S | Tektro HD-M276 hydraulic disc, short reach

- Size: M , ML , L , XL , XXL | Tektro HD-M275 hydraulic disc

Rotor size: Max brake rotor sizes - Frame: 180mm (XXS: 160mm), Fork: see fork manufacturer

WEIGHT

Weight: M - 15.10 kg / 33.29 lbs (with tubes)

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

The manufacturer reserves 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. The prices shown are the manufacturer's suggested retail prices.