Trek Marlin Gen 3 Frameset
Trek / Cross Country Mountain Bikes
Your first trail is waiting.
Marlin Frameset is a lightweight aluminum frame ready to build into an easygoing, capable trail bike. Its updated geometry is more confident than ever, helping you gain control and speed on singletrack. With mounts for racks and a kickstand, it’s just as ready for everyday riding as it is for the trail.
Based on the bike's size chart. Your complimentary baseline fit in store dials in the rest.
Ship to store · free pickup, usually ready in 4–7 business days
Questions are welcome. No pressure, no bike jargon required.
The ride, not just the specs
Marlin is the mountain bike we hand to riders getting into trails. It's simple, tough, and confidence-inspiring, so you can focus on having fun.
Ride it on your local singletrack, the greenway, or anywhere in between.
What makes it special
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.
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.
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.
For the detail-oriented
Tap any group to see every part.
Measurements in cm unless noted.
| Size | XXS | XS | S | M | ML | L | XL | XXL |
|---|---|---|---|---|---|---|---|---|
| Rider height | 4'9"–5'1" | 5'1"–5'5" | 5'5"–5'10" | 5'8"–5'11" | 5'10"–6'2" | 6'2"–6'5" | ||
| Seat tube (A on the drawing) | 32.0 | 34.0 | 37.0 | 42.0 | 43.5 | 45.0 | 50.0 | 54.0 |
| Seat tube angle (B on the drawing) | 74.0° | 73.8° | 73.8° | 73.4° | 73.4° | 73.4° | 73.4° | 73.4° |
| Head tube length (C on the drawing) | 9.0 | 9.0 | 10.0 | 10.5 | 11.0 | 11.5 | 13.5 | 15.0 |
| Head tube angle (D on the drawing) | 66.5° | 66.5° | 66.5° | 66.5° | 66.5° | 66.5° | 66.5° | 66.5° |
| Eff. top tube (E on the drawing) | 52.1 | 55.1 | 57.9 | 61.5 | 63.1 | 64.7 | 67.8 | 70.7 |
| BB height (F on the drawing) | 30.2 | 31.3 | 31.3 | 30.8 | 30.8 | 30.8 | 30.8 | 30.8 |
| BB drop (G on the drawing) | 3.8 | 4.5 | 4.5 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 |
| Chainstay length (H on the drawing) | 43.3 | 43.3 | 43.3 | 43.8 | 43.8 | 43.8 | 43.8 | 43.8 |
| Offset (I on the drawing) | 4.0 | 4.2 | 4.2 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 |
| Trail (J on the drawing) | 10.4 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 |
| Wheelbase (K on the drawing) | 106.0 | 109.2 | 112.1 | 116.3 | 118.0 | 119.7 | 123.0 | 126.1 |
| Standover (L on the drawing) | 65.0 | 65.8 | 69.2 | 74.7 | 75.9 | 77.1 | 79.1 | 81.6 |
| Reach (M on the drawing) | 36.5 | 39.0 | 41.5 | 44.0 | 45.5 | 47.0 | 49.5 | 52.0 |
| Stack (N on the drawing) | 54.4 | 56.3 | 57.2 | 60.9 | 61.4 | 61.8 | 63.7 | 65.1 |
| Frame size | 13.5" | 14.5" | 15.5" | 17.5" | 18.5" | 19.5" | 21.5" | 23" |
| Wheel size | 26" | 27.5" | 27.5" | 29" | 29" | 29" | 29" | 29" |
| Eff. seat tube angle | 74.0° | 74.0° | 74.0° | 74.0° | 74.0° | 74.0° | 74.0° | 74.0° |
The Atlanta Cycling difference
Specs matter. But so does how a bike feels when you ride it. Our team is here to help you choose the right size, understand the details, and get comfortable before your first ride.
When you buy from Atlanta Cycling, you're not just getting a box with a bicycle in it. You're getting a 30-day money-back guarantee, a complimentary baseline fit, lifetime basic adjustments, and real people who want you to love every mile.
Four neighborhood stores. One shared passion.
Ansley. Alpharetta. Roswell. Vinings. Stop by, take a test ride, ask questions, and meet the people who will be here long after your first ride.
