Trek Marlin 7 Gen 3 - 2025

It's right for you if...

You want a go-anywhere trail bike that's got upgrades where it matters most, but won't break the bank. You want to build skills on the trail, and need a bike with confidence-inspiring geometry and upgraded components that can keep up with your progress.

The tech you get

A lightweight aluminium frame with modern trail riding geometry and internal routing that keeps cables protected and the bike looking sleek. An upgraded RockShox suspension fork smooths out rowdy trails, 12-speed SRAM SX Eagle shifting and the serious stopping power of hydraulic disc brakes.

The final word

The Marlin 7 is the go-to trail bike for those wanting to build skills on the singletrack and get the right bang for their buck with upgraded suspension and confidence-inspiring geometry.

Why you'll love it

• The Marlin Gen 3 gives you serious trail capability with bigger tyre clearance, internal dropper post routing, ThruSkew rear axle and longer, slacker geometry that gives you more stability on steeper trails and at higher speeds
• Its upgraded RockShox fork gives you 100 mm of suspension for turning rocks and roots in the trail into smooth-sailing
• Rack and mudguard mounts make it easy to accessorise, so your mountain bike can double as a rugged commuter
• 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 | RockShox Judy Silver, Solo Air spring, rebound adjust, TurnKey hydraulic lockout, 42 mm offset for 27.5" wheel, 100 mm QR, 80 mm travel

- Size: XS , S | RockShox Judy Silver, Solo Air spring, rebound adjust, TurnKey hydraulic lockout, 42 mm offset for 27.5" wheel, 100 mm QR, 100 mm travel

- Size: M , ML , L , XL , XXL | RockShox Judy Silver, Solo Air spring, rebound adjust, TurnKey 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 LW, alloy, 6-bolt, 5x100 mm QR

Hub rear: Formula DC-22LW, 6-bolt, Shimano 8/9/10 freehub, 135x5 mm QR

Skewer rear: 173x5 mm QR

Rim: Bontrager Kovee, double-wall, Tubeless-Ready, 28-hole, 23 mm width, Presta valve

Tyre:

- Size: XXS | Maxxis Ardent, tubeless ready, EXO casing, folding bead, 60tpi, 26x2.40"

- Size: XS , S | Maxxis Ardent, tubeless ready, EXO casing, folding bead, 60tpi, 27.5x2.40"

- Size: M , ML , L , XL , XXL | Maxxis Ardent, tubeless ready, EXO casing, folding bead, 60tpi, 29x2.40"

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

DRIVETRAIN

Shifter: SRAM SX Eagle, 12-speed

Rear derailleur: SRAM SX Eagle

Crank:

- Size: XXS | SRAM SX Eagle, 30T steel ring, 49 mm chainline, 155 mm length

- Size: XS , S , M | SRAM SX Eagle, 30T steel ring, 49 mm chainline, 170 mm length

- Size: ML , L , XL , XXL | SRAM SX Eagle, 30T steel ring, 49 mm chainline, 175 mm length

Bottom bracket: Truvativ Powerspline, 73 mm, threaded cartridge, 118 mm spindle

Cassette: SRAM PG-1210 Eagle, 11-50, 12-speed

Chain: SRAM SX Eagle, 12-speed

Pedal: VP-536 nylon platform

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

COMPONENTS

Saddle: Bontrager Verse Short, stainless steel rails

Seatpost:

- Size: XXS , XS , S | TranzX JD-YSP18, 100 mm travel, internal routing, 31.6 mm, 361 mm length

- Size: M | TranzX JD-YSP18, 130mm travel, internal routing, 31.6 mm, 425 mm length

- Size: ML , L , XL , XXL | TranzX JD-YSP18, 150 mm travel, internal routing, 31.6 mm, 470 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: Shimano MT200 hydraulic disc

Brake rotor:

- Size: XXS , XS , S , M , ML , L , XL , XXL | Shimano RT26, 6-bolt,160 mm

- Size: M , ML , L , XL , XXL | Shimano RT26, 6-bolt,180 mm

Brake Set: Shimano MT200 hydraulic disc

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

WEIGHT

Weight: M - 15.03 kg / 33.14 lbs (with TLR sealant, no 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.