The Trek Marlin 5 Gen 3 2027 steps up from the 4 with a lockout fork and a wider-range 9-speed drivetrain — a genuine step toward proper light trail riding while still working well as a commuter.
WHO THIS BIKE SUITS
You've ridden a bit and want more capability than an entry-level bike without paying for features you won't use yet.
You split your riding between commuting and light trails and want one bike that's genuinely good at both.
You want a fork lockout for flicking between smooth roads and rougher ground.
IF YOU'RE LOOKING FOR SOMETHING DIFFERENT
If budget is the main factor, the Marlin 4 gets you riding for less. If you're planning on proper trail riding regularly, the Marlin 6 adds a wide-range 1x10 drivetrain and a dropper post that make a real difference once the terrain gets technical.
WHERE IT SITS IN THE RANGE
The Marlin 5 sits just above the 4 — same frame platform, better fork with lockout, and a wider-range 9-speed drivetrain in place of the 4's 8-speed.
Full Marlin Gen 3 range: Marlin 4 — Marlin 6 — Marlin 7.
HOW IT RIDES
Fork
The SR Suntour XCT adds a hydraulic lockout over the 4's simpler fork — flip it on for the road, off for the trail, and the front end firms up noticeably for efficient pedalling.
Drivetrain
Shimano's CUES 9-speed setup with an 11-46 cassette gives a genuinely wider range than the 4 — climbs feel more manageable, and shifting is a step smoother.
THE FINAL WORD
The Trek Marlin 5 Gen 3 2027 is the sensible middle ground in the Marlin range — enough capability for real trail riding without the price jump of the top two models. Come in and we'll talk through whether the 5 or the 6 above it makes more sense for how often you'll actually get out on proper trails.
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.
Frame: Alpha Silver Aluminium, internal derailleur and dropper post routing, rack and kickstand mount, 135x5 mm ThruSkew
Headset: Semi-integrated, 1-1/8"
Bottom bracket: Shimano, 73 mm, threaded cartridge, 122.5 mm spindle
Fork: SR Suntour XCT 30, coil spring, preload, hydraulic lockout, 42 mm offset for 27.5" wheel, 100 mm travel
Rear derailleur: Shimano CUES U4000
Crank: Shimano CUES U4001, 32T, 52mm chain line, 170 mm length
Cassette: Shimano LINKGLIDE LG300, 11-46, 9-speed
Chain: Shimano LG500
Brakeset: Shimano hydraulic disc
Rotors: Shimano RT26, 6-bolt, 160 mm
Rims: Bontrager Connection, double-wall, 32-hole, 20 mm width, Schrader valve
Front hub: Formula DC-20, alloy, 6-bolt, 100x5 mm
Rear hub: Formula DC-22, alloy, 6-bolt, Shimano 8/9/10 freehub, 135x5 mm
Tyres: Bontrager Montrose Comp, wire bead, 30 tpi, 27.5x2.40"
Handlebar: Bontrager alloy, 31.8 mm, 15 mm rise, 720 mm width
Stem: Bontrager Comp, 31.8 mm, 7-degree, 35 mm length
Grips: Trek Line Comp, nylon lock-on
Saddle: Bontrager Verse Short, stainless steel rails
Seatpost: Bontrager alloy, 31.6 mm, 12 mm offset, 330 mm length
Personalised Bike Consultation
Not sure which model is perfect for you? Our expert team at All Ride Now in Midhurst, West Sussex is here to help you choose with confidence.
- Will you be riding mainly on or off-road?
- Do you prefer an upright or sportier riding position?
- Are you looking for longer range, lighter weight, or a more comfortable feel?
Through a friendly consultation – in-store, by phone, live chat or email – we’ll help you narrow down your options and find the bike that best fits your needs.
