
Marlin 4 is a trail-worthy daily rider that's perfectly suited for everyday adventures, on and off the trail. It features a trail-savvy frame with a suspension fork, 8-speed Shimano ESSA shifting and mounts for a rack and kickstand that make it an ideal choice for trail riders or anyone looking for a comfortable, stable commuter with the ruggedness of a real mountain bike.
Specifications
| Frame | Alpha Silver Aluminium, internal derailleur and dropper post routing, rack and kickstand mounts, 135x5 mm ThruSkew |
| Fork | SR Suntour, coil spring, preload, 100 mm QR — travel and offset vary by size (80–100 mm) |
| Shifting | Shimano M315 shifter, ESSA U2000 rear derailleur, 8-speed |
| Crank | ProWheel alloy, 32T narrow-wide steel ring — 160 mm (XXS–XS), 170 mm (S–ML), 175 mm (L–XXL) |
| Cassette | Shimano HG300, 11-45, 8-speed |
| Chain | KMC Z8.3, 8-speed |
| Hubs | Formula DC-20 front / DC-22 rear, alloy, 6-bolt, Shimano 8/9/10-speed freehub |
| Rim | Bontrager Connection, double-wall, 32-hole, 20 mm width, Schrader valve |
| Tyres | Bontrager Montrose Comp, wire bead, 30 tpi — 26x2.35″ (XXS), 27.5x2.40″ (XS–S), 29x2.40″ (M–XXL) |
| Saddle | Bontrager Verse Short, stainless steel rails |
| Seatpost | Bontrager alloy, 31.6 mm, 12 mm offset — 300–400 mm depending on size |
| Handlebar | Bontrager alloy, 31.8 mm — 690–750 mm width depending on size |
| Grips | Trek Line Comp, nylon lock-on |
| Stem | Bontrager Comp, 31.8 mm, 7° — 35–70 mm depending on size |
| Brakes | Tektro / Power hydraulic disc, 160 mm rotors (S–down) or 180 mm (M–up) |
| Bike weight (M) | 14.90 kg / 32.85 lbs |
| Weight limit | 136 kg / 300 lbs total — bike + rider + cargo |
Specifications subject to change without notice; compatible parts may be substituted due to supply chain issues.
Sizing and geometry
Sizing
| Size | XS | S | M | ML | L | XL | 2XL |
|---|---|---|---|---|---|---|---|
| Rider height | 145–155 cm | 155–165 cm | 165–177 cm | 173–180 cm | 177–188 cm | 188–195 cm | 195–203 cm |
| Inseam | 69–73 cm | 74–78 cm | 79–83 cm | 81–86 cm | 84–89 cm | 89–91 cm | 91–97 cm |
All measurements in cm unless stated otherwise.
| Frame size | XS | S | M | ML | L | XL |
|---|---|---|---|---|---|---|
| Seat tube | 34.0 | 37.0 | 41.9 | 44.4 | 47.0 | 52.1 |
| Seat tube angle | 73.8° | 73.8° | 71.9° | 71.9° | 71.9° | 71.9° |
| Head tube length | 9.0 | 10.0 | 9.0 | 9.0 | 10.0 | 12.0 |
| Head angle | 66.5° | 66.5° | 69.5° | 69.5° | 69.5° | 69.5° |
| Effective top tube | 55.1 | 57.9 | 60.2 | 61.8 | 63.8 | 65.9 |
| Bottom bracket height | 31.3 | 31.3 | 31.0 | 31.0 | 31.0 | 31.0 |
| Bottom bracket drop | 4.5 | 4.5 | 5.8 | 5.8 | 5.8 | 5.8 |
| Chainstay length | 43.3 | 43.3 | 43.8 | 43.8 | 43.8 | 43.8 |
| Wheelbase | 109.2 | 112.1 | 110.0 | 111.6 | 113.7 | 115.9 |
| Standover | 65.8 | 69.2 | 74.8 | 75.8 | 75.7 | 76.9 |
| Frame reach | 39.0 | 41.5 | 41.8 | 43.4 | 45.1 | 46.6 |
| Frame stack | 56.3 | 57.2 | 60.2 | 60.2 | 61.1 | 63.0 |
Trek bicycles and Bontrager accessories are reserved online and collected in person — this ensures the right size, a proper bike fit and expert guidance before you ride away.



