Trek Marlin 7 Gen 3 Mountain Bike 2025 - Hardtail MTB
Built with trail-ready geometry, a smooth RockShox Solo Air fork and wide-range SRAM 12-speed drivetrain, the Marlin 7 Gen 3 is perfect for progressing on singletrack, with everyday versatility for commuting or fitness rides.
Key Features:
- Alpha Silver Aluminium frame with modern geometry and internal cable routing
- RockShox Judy Silver Solo Air fork with 100mm travel and hydraulic lockou
- SRAM SX Eagle 12-speed drivetrain with 11–50T wide-range cassette
- Shimano MT200 hydraulic disc brakes for confident, responsive braking
- 29" Bontrager Kovee wheels with Maxxis Ardent 2.4" tubeless-ready tyres
- Dropper post compatibility and mudguard, rack, and kickstand mounts
- Available with 0% APR finance
The Trek Marlin 7 Gen 3 hits the sweet spot for riders ready to upgrade their trail experience with quality components and dialled geometry without stretching the budget. With its Alpha Silver Aluminium frame, Trek brings you a lightweight yet sturdy platform built with longer, slacker trail geometry for better handling and control, whether you're navigating tight switchbacks or speeding downhill.
The real upgrade here is the RockShox Judy Silver fork, which uses a Solo Air spring and 100mm of travel to soak up rocks, roots and ruts, with rebound adjustment and a TurnKey hydraulic lockout for added efficiency on smoother sections. It’s a big step up from coil-sprung forks often found in this category.
Paired with the fork is a SRAM SX Eagle 12-speed drivetrain, giving you the same wide-range 11–50T cassette found on more expensive bikes. It offers reliable shifting and enough low gears to conquer climbs with ease, backed by SRAM’s 1x simplicity and rugged reliability.
Stopping power is handled by Shimano MT200 hydraulic disc brakes, offering great modulation and control in all conditions. Meanwhile, Maxxis Ardent 2.4" tyres provide serious grip on loose terrain, and are fitted to tubeless-ready Bontrager Kovee rims for those who want to upgrade to lower pressures and fewer flats.
The Marlin 7 Gen 3 also brings commuter practicality thanks to rack, mudguard and kickstand mounts, and internal cable routing makes it easy to add a dropper post for more confident descending. Smaller frame sizes (XXS and XS) include a curved top tube for easier mounting and dismounting, making this bike accessible to a wide range of riders.
Whether you’re hitting the trail for the first time or levelling up from a starter hardtail, the Trek Marlin 7 Gen 3 offers impressive performance where it counts.
Occasionally, without notice, manufacturers change product design and/or specifications.
| Frame | Alpha Silver Aluminium, internal derailleur and dropper post routing, rack and kickstand mount, 135x5 mm ThruSkew |
| Fork | RockShox Judy Silver, Solo Air spring, rebound adjust, TurnKey hydraulic lockout, 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, 50 mm length |
| Bars | Bontrager alloy, 31.8 mm, 15 mm rise, 750 mm width |
| Front Brake | Shimano MT200 Hydraulic Disc |
| Rear Brake | Shimano MT200 Hydraulic Disc |
| Rear Mech | SRAM SX Eagle, 12-speed |
| Shifters | SRAM SX Eagle, 12-speed |
| Speed | 12 |
| Rims | Bontrager Kovee, double-wall, Tubeless-Ready, 28-hole, 23 mm width, Presta valve |
| Front Hub | Formula DC-20 LW, alloy, 6-bolt, 5x100 mm QR |
| Rear Hub | Formula DC-22LW, 6-bolt, Shimano 8/9/10 freehub, 135x5 mm QR |
| Front Tyre | Maxxis Ardent, tubeless ready, EXO casing, folding bead, 60tpi, 29x2.40" |
| Rear Tyre | Maxxis Ardent, tubeless ready, EXO casing, folding bead, 60tpi, 29x2.40" |
| Seat Post | TranzX JD-YSP18, 150 mm travel, internal routing, 31.6 mm, 470 mm length |
| Saddle | Bontrager Verse Short, stainless steel rails |
| Chainset | SRAM SX Eagle, 30T steel ring, 49 mm chainline, 175 mm length |
| Bottom Bracket | Truvativ Powerspline, 73 mm, threaded cartridge, 118 mm spindle |
| Chain | SRAM SX Eagle, 12-speed |
| Cassette | SRAM PG-1210 Eagle, 11-50, 12-speed |
| Pedals | VP-536 nylon platform |
Trek Marlin Gen 3 Sizing Guide
| 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 3 Geometry Chart
| Size | XS | S | M | ML | L | XL | XXL |
|---|---|---|---|---|---|---|---|
| Stack | 563 | 572 | 601 | 614 | 618 | 637 | 651 |
| Reach | 390 | 415 | 440 | 455 | 470 | 495 | 520 |
| Head Tube Length | 90 | 100 | 105 | 110 | 115 | 135 | 150 |
| Head Tube Angle | 66.5° | 66.5° | 66.5° | 66.5° | 66.5° | 66.5° | 66.5° |
| Bottom Bracket Height | 313 | 313 | 308 | 308 | 308 | 308 | 308 |
| Bottom Bracket Drop | 45 | 45 | 60 | 60 | 60 | 60 | 60 |
| Trail | 110 | 110 | 110 | 110 | 110 | 110 | 110 |
| Fork Rake/Offset | 42 | 42 | 46 | 46 | 46 | 46 | 46 |
| Chainstay Length | 433 | 433 | 438 | 438 | 438 | 438 | 438 |
| Wheelbase | 1092 | 1121 | 1153 | 1180 | 1197 | 1230 | 1261 |
| Top Tube Length (horizontal) | 551 | 579 | 615 | 631 | 647 | 678 | 707 |
| Standover Height | 658 | 692 | 747 | 759 | 771 | 791 | 816 |
| Seat Tube Length | 340 | 370 | 420 | 435 | 450 | 500 | 540 |
| Seat Tube Angle | 73.8° | 73.8° | 73.4° | 73.4° | 73.4° | 73.4° | 73.4° |
| Effective Seat Tube Angle | 74.0° | 74.0° | 74.0° | 74.0° | 74.0° | 74.0° | 74.0° |
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 7 Gen 3 Mountain Bike 2025 - Hardtail MTB
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