Trek Marlin 4 Gen 2 Mountain Bike 2025 - Hardtail MTB
The Trek Marlin 4 Gen 2 is a versatile mountain bike designed for new riders exploring trails and paths. With a confidence-boosting suspension fork, Shimano 14-speed drivetrain and rack mounts, it's built for more than just off-road.
Key Features
- Alpha Silver Aluminium frame with internal cable routing and commuter-friendly mounts
- SR Suntour XCE 28 coil spring fork with 100 mm travel
- Shimano Altus/Tourney drivetrain with 14-speed gear range
- Tektro MD-M280/281 mechanical disc brakes, 160 mm rotors
- 29" wheels with Bontrager XR2 Comp 2.20" tyres
- Curved top tube on XS/S sizes for easier mounting
- Available with 0% APR finance
The Marlin 4 Gen 2 is Trek’s gateway into mountain biking—an entry-level hardtail that’s ready for your first trail rides, gravel paths or off-road shortcuts on the daily commute. At the heart of the bike is a durable Alpha Silver Aluminium frame, with clean internal cable routing for a neat finish and mounts for racks, kickstands and mudguards, making it just as capable for utility as it is for weekend escapes.
With SR Suntour XCE suspension up front offering 100 mm of travel, it smooths out rough tracks and uneven paths, giving you more comfort and control when heading off-road. The Shimano 14-speed drivetrain combines Altus and Tourney components, offering simple, reliable shifting with enough range to handle hills and flats.
Tektro mechanical disc brakes provide consistent stopping power in all weather, and the 29-inch Bontrager wheels are fitted with wide XR2 Comp 2.20" tyres, giving good grip across variable terrain. For smaller riders, Trek’s thoughtful geometry on XS and S sizes features a curved top tube and short-reach brake levers, making the bike easier to handle and more comfortable to control.
Whether you’re discovering trails, cruising rail paths, or need a bike that can hop kerbs on the school run, the Marlin 4 is a dependable first mountain bike with the versatility to take you further. It’s also covered by Trek’s lifetime frame warranty, giving you long-term peace of mind.
Occasionally, without notice, manufacturers change product design and/or specifications.
| Frame | Alpha Silver Aluminium, internal routing, chainstay disc-brake mount, rack and kickstand mount, 135x5 mm QR |
| Fork | SR Suntour XCE 28, coil spring, preload, 46 mm offset for 29" wheel, 100 mm QR, 100 mm travel |
| Headset | Semi-Integrated, 1-1/8" |
| Stem | Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 70 mm length |
| Bars | Bontrager alloy, 31.8 mm, 15 mm rise, 750 mm width |
| Front Brake | Tektro MD-M280 mechanical disc // Tektro MD-M281 mechanical disc // Tektro MD-M280 mechanical disc, 160 mm rotor // Tektro MD-M281 mechanical disc, 160 mm rotor |
| Rear Brake | Tektro MD-M280 mechanical disc // Tektro MD-M281 mechanical disc // Tektro MD-M280 mechanical disc, 160 mm rotor // Tektro MD-M281 mechanical disc, 160 mm rotor |
| Front Mech | Shimano Altus M315, 34.9 mm clamp, top swing, dual pull |
| Rear Mech | Shimano Tourney TY300 |
| Shifters | Shimano Altus EF500, 7-speed |
| Speed | 14 |
| Rims | Bontrager Connection, double-wall, 32-hole, 20 mm width, Schrader valve |
| Front Hub | Formula DC-20, alloy, 6-bolt, 5x100 mm QR |
| Rear Hub | Formula DC-31, alloy, 6-bolt, 6/7/8-speed freewheel, 135x5 mm QR |
| Front Tyre | Bontrager XR2 Comp, wire bead, 30 tpi, 29x2.20" |
| Rear Tyre | Bontrager XR2 Comp, wire bead, 30 tpi, 29x2.20" |
| Seat Post | Bontrager alloy, 31.6 mm, 12 mm offset, 400 mm length |
| Saddle | Bontrager Verse Short, stainless steel rails |
| Chainset | ProWheel TM-CY10, 36/22, 175 mm length |
| Bottom Bracket | VP BC73, 73 mm, threaded cartridge |
| Chain | KMC Z7, 7-speed |
| Cassette | Shimano TZ500, 14-34, 7-speed |
| Pedals | VP-536 nylon platform |
Trek Marlin Gen 2 Sizing Chart
| Size | Height (cm) | Height (Feet / Inches) | Inseam (cm) | Inseam (Inches) |
|---|---|---|---|---|
| XS | 145 - 155 cm | 4'9" - 5'1" | 69 - 73 cm | 27" - 29" |
| S | 155 - 165 cm | 5'1" - 5'5" | 74 - 78 cm | 29" - 31" |
| M | 165 - 176 cm | 5'5" - 5'9" | 79 - 83 cm | 31" - 33" |
| ML | 173 - 180 cm | 5'8" - 5'11" | 81 - 86 cm | 32" - 34" |
| L | 177 - 188 cm | 5'10" - 6'2" | 84 - 89 cm | 33" - 35" |
| XL | 188 - 195 cm | 6'2" - 6'5" | 89 - 91 cm | 35" - 36" |
| XXL | 195 - 203 cm | 6'5" - 6'8" | 91 - 97 cm | 36" - 38" |
What size frame do I need if I am between sizes? - read here
Trek Marlin Gen 2 Geometry Chart
| Size | XS | S | M | ML | L | XL | XXL |
|---|---|---|---|---|---|---|---|
| Stack | 565 | 574 | 602 | 602 | 611 | 630 | 630 |
| Reach | 376 | 385 | 418 | 434 | 451 | 460 | 480 |
| Head Tube Length | 90 | 90 | 90 | 90 | 100 | 120 | 120 |
| Head Tube Angle | 69.3° | 69.3° | 69.0° | 69.5° | 69.5° | 69.5° | 69.5° |
| Bottom Bracket Height | 292 | 302 | 310 | 310 | 310 | 310 | 310 |
| Bottom Bracket Drop | 58 | 48 | 58 | 58 | 58 | 58 | 58 |
| Trail | 88 | 88 | 93 | 93 | 93 | 93 | 93 |
| Fork Rake/Offset | 42 | 42 | 42 | 42 | 42 | 42 | 42 |
| Chainstay Length | 438 | 438 | 438 | 438 | 438 | 438 | 438 |
| Wheelbase | 1049 | 1066 | 1100 | 1116 | 1137 | 1159 | 1173 |
| Top Tube Length (horizontal) | 544 | 555 | 602 | 618 | 638 | 659 | 673 |
| Standover Height | 658 | 686 | 746 | 758 | 757 | 769 | 804 |
| Seat Tube Length | 343 | 368 | 419 | 444 | 470 | 521 | 559 |
| Seat Tube Angle | 73.5° | 73.5° | 71.9° | 71.9° | 71.9° | 71.9° | 71.9° |
| Effective Seat Tube Angle | 73.5° | 73.5° | 73.0° | 73.0° | 73.0° | 73.0° | 73.0° |
All measurements are in mm unless otherwise stated.
The above table shows the standard geometry for the bicycle as shipped, other geometry configurations may be available with certain bikes. Please contact us via Live Chat to find out more.
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Trek Marlin 4 Gen 2 Mountain Bike 2025 - Hardtail MTB
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