Trek Roscoe Gen 4 Frameset
Trek / Trail Mountain Bikes
A trail hardtail made for fun.
Roscoe Frameset is a build-your-own-adventure hardtail frame that’s ready to get down. Its Alpha Platinum Aluminum frame features progressive trail geometry that’s confident on everything from fast, loose singletrack to jump lines, and it’s designed to pair with a 150mm fork. Build it your way and take it wherever your riding leads.
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
Roscoe is a hardtail built for having fun on the trail. It's tough, easy to look after, and grippy enough to try new things.
It's a great bike for learning skills, riding with friends, and lapping your local trails.
What makes it special
With 150mm front travel, trail-smashing 29-inch wheels, and dialed-for-dirt frame features, Roscoe is ready to get rowdy on your favorite rides.
The bolt on downtube guard will stay put even after ripping though a chucky trail, keeping your bike quiet and protected.
A long reach, slack head angle, steep seat angle, and short chain stays combine for a ride that's confidence inspiring, yet still nimble and fun.
For the detail-oriented
Tap any group to see every part.
Measurements in cm unless noted.
| Size | S | M | ML | L | XL |
|---|---|---|---|---|---|
| Rider height | 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) | 33.0 | 37.5 | 40.0 | 42.5 | 45.0 |
| Seat tube angle (B on the drawing) | 73.1° | 73.1° | 74.1° | 74.1° | 75.1° |
| Head tube length (C on the drawing) | 9.0 | 10.0 | 10.5 | 12.0 | 14.5 |
| Head tube angle (D on the drawing) | 65.0° | 65.0° | 65.0° | 65.0° | 65.0° |
| Eff. top tube (E on the drawing) | 57.5 | 61.1 | 61.4 | 63.2 | 65.5 |
| BB height (F on the drawing) | 31.1 | 31.2 | 31.2 | 31.2 | 31.2 |
| BB drop (G on the drawing) | 4.5 | 6.1 | 6.1 | 6.1 | 6.1 |
| Chainstay length (H on the drawing) | 42.5 | 43.0 | 43.0 | 43.0 | 43.0 |
| Offset (I on the drawing) | 3.7 | 4.4 | 4.4 | 4.4 | 4.4 |
| Trail (J on the drawing) | 12.5 | 12.5 | 12.5 | 12.5 | 12.5 |
| Wheelbase (K on the drawing) | 113.9 | 118.6 | 120.3 | 122.4 | 126.5 |
| Standover (L on the drawing) | 71.4 | 73.5 | 74.0 | 74.0 | 74.0 |
| Reach (M on the drawing) | 41.5 | 44.0 | 45.5 | 47.0 | 50.0 |
| Stack (N on the drawing) | 60.4 | 64.4 | 64.8 | 66.2 | 68.4 |
| Frame size | 15.5" | 17.5" | 18.5" | 19.5" | 21.5" |
| Wheel size | 27.5" | 29" | 29" | 29" | 29" |
| Eff. seat tube angle | 75.0° | 75.0° | 76.0° | 76.0° | 77.0° |
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.
