Trek Marlin Gen 3 Frameset
Description
- Marlin Gen 3 gives you serious trail capability with bigger tire clearance, internal dropper post routing, ThruSkew rear axle, and longer, slacker geometry that gives you more stability on steeper trails and at higher speeds
- You'll get a lightweight aluminum frame that's robust enough for the ride without weighing you down
- Fender mounts make it easy to accessorize, so your mountain bike can double as a rugged commuter
- Marlin models in XXS and XS frame sizes have a curved top tube and a lower standover height that makes it easier for smaller riders to mount and dismount
- Internal routing looks sleek and makes adding a dropper post easy
Tech Specs
| Frame | Alpha Silver Aluminum, internal derailleur & dropper post routing, rack and kickstand mount, 135x5mm ThruSkew |
| Skewer Rear | 173x5mm QR |
| Seat Collar | Bolt-on, 36.4mm |
| Headset | Semi-integrated, 1-1/8'' |
Product Identifiers
| Brand | Trek |
| Type | Mountain Bike |
| SKU | 5288504 |
| UPC | 601842859506 |
| MPN | 5288504 |
Expanded size range
With 8 different sizes, Marlin has a bike made to fit every rider. Each frame is equipped with smart wheel sizing, with XXS frames rolling on 26" wheels, and wheel sizes increasing proportionally along with frame sizes, so every rider gets the fit they need.
Trail-ready, Upgrade-ready
The secret to Marlin's popularity is a real trail-savvy mountain bike frame that's upgrade compatible, so it can grow with you as you take on bigger trails and tougher features.
Roll stronger with Thru Skew
Goodbye open dropouts. The Thru Skewer is a better, stronger, more precisely aligned rear wheel retention system that keeps your wheel more secure than quick-release skewers while still using the standard 135mm rear hub spacing.
A better way to produce aluminum
Starting in 2024, we began removing high-emission aluminum from our manufacturing and replacing it with low-emission aluminum made with renewable energy. By October 2025, nearly every alloy bike we make - this one included - had made the switch, driving a major drop in our footprint.
Geometry
| B B Drop | 6 |
| B B Height | 30.8 |
| Chainstay Length | 43.8 |
| Eff Seat Tube Angle | 74.0° |
| Eff Top Tube | 63.1 |
| Frame Reach | 45.5 |
| Frame Size Letter | ML |
| Frame Size Number | 18.5" |
| Frame Stack | 61.4 |
| Head Angle | 66.5° |
| Head Tube Length | 11 |
| Offset | 4.6 |
| Seat Tube | 43.5 |
| Seat Tube Angle | 73.4° |
| Standover | 75.9 |
| Trail | 11 |
| Wheelbase | 118 |
| Wheel Size | 29" |