Trek Rail+ AL Gen 5 Frameset
Trek / Electric Mountain Bikes
More trail in every ride.
Rail+ AL Frameset is an e-MTB frame ready for your rowdiest rides and your dreamiest build. Its Alpha Platinum Aluminum chassis is designed for a 160mm shock and fork, 29˝ wheels, and a Bosch CX Line motor. Fork, shock, motor, and battery not included.
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
Rail is an electric mountain bike for riders who want more: more laps, more climbing, and more time on the fun parts of the trail.
The motor helps you up so you have plenty left for the way down.
What makes it special
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.
For the detail-oriented
Tap any group to see every part.
Measurements in cm unless noted.
| Size | S | S | S | S | M | M | M | M | L | L | L | XL | XL | XL |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rider height | 5'1"–5'5" | 5'1"–5'5" | 5'1"–5'5" | 5'1"–5'5" | 5'5"–5'10" | 5'5"–5'10" | 5'5"–5'10" | 5'5"–5'10" | 5'10"–6'2" | 5'10"–6'2" | 5'10"–6'2" | 6'2"–6'5" | 6'2"–6'5" | 6'2"–6'5" |
| Seat tube (A on the drawing) | 38.0 | 38.0 | 38.0 | 38.0 | 41.0 | 41.0 | 41.0 | 41.0 | 43.5 | 43.5 | 43.5 | 47.0 | 47.0 | 47.0 |
| Seat tube angle (B on the drawing) | 74.8° | 74.8° | 74.8° | 74.8° | 74.8° | 74.8° | 74.8° | 74.8° | 75.2° | 75.2° | 75.2° | 75.2° | 75.2° | 75.2° |
| Head tube length (C on the drawing) | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 12.0 | 12.0 | 12.0 | 14.5 | 14.5 | 14.5 |
| Head tube angle (D on the drawing) | 64.5° | 64.5° | 64.5° | 64.5° | 64.5° | 64.5° | 64.5° | 64.5° | 65.0° | 65.0° | 65.0° | 64.9° | 64.9° | 64.9° |
| Eff. top tube (E on the drawing) | 56.3 | 56.3 | 56.3 | 56.3 | 59.2 | 59.2 | 59.2 | 59.2 | 63.8 | 63.8 | 63.8 | 66.9 | 66.9 | 66.9 |
| BB height (F on the drawing) | 33.9 | 33.9 | 33.9 | 33.9 | 33.9 | 33.9 | 33.9 | 33.9 | 34.5 | 34.5 | 34.5 | 34.5 | 34.5 | 34.5 |
| BB drop (G on the drawing) | 1.8 | 1.8 | 1.8 | 1.8 | 2.4 | 2.4 | 2.4 | 2.4 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 |
| Chainstay length (H on the drawing) | 44.8 | 44.8 | 44.8 | 44.8 | 44.8 | 44.8 | 44.8 | 44.8 | 44.6 | 44.6 | 44.6 | 44.6 | 44.6 | 44.6 |
| Offset (I on the drawing) | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 |
| Trail (J on the drawing) | 12.2 | 12.2 | 12.2 | 12.2 | 13.1 | 13.1 | 13.1 | 13.1 | 12.7 | 12.7 | 12.7 | 12.7 | 12.7 | 12.7 |
| Wheelbase (K on the drawing) | 120.2 | 120.2 | 120.2 | 120.2 | 123.0 | 123.0 | 123.0 | 123.0 | 127.7 | 127.7 | 127.7 | 131.3 | 131.3 | 131.3 |
| Standover (L on the drawing) | 75.8 | 75.8 | 75.8 | 75.8 | 76.9 | 76.9 | 76.9 | 76.9 | 77.5 | 77.5 | 77.5 | 79.8 | 79.8 | 79.8 |
| Reach (M on the drawing) | 43.0 | 43.0 | 43.0 | 43.0 | 45.0 | 45.0 | 45.0 | 45.0 | 49.5 | 49.5 | 49.5 | 52.0 | 52.0 | 52.0 |
| Stack (N on the drawing) | 59.8 | 59.8 | 59.8 | 59.8 | 63.1 | 63.1 | 63.1 | 63.1 | 64.5 | 64.5 | 64.5 | 66.8 | 66.8 | 66.8 |
| Frame size | 15.5" | 15.5" | 15.5" | 15.5" | 17.5" | 17.5" | 17.5" | 17.5" | 19.5" | 19.5" | 19.5" | 21.5" | 21.5" | 21.5" |
| Position | Low | Low | Low | Low | Low | Low | Low | Low | High | High | High | High | High | High |
| Wheel size | 27.5" | 27.5" | 27.5" | 27.5" | 29"/27.5" | 29"/27.5" | 29"/27.5" | 29"/27.5" | 29"/27.5" | 29"/27.5" | 29"/27.5" | 29"/27.5" | 29"/27.5" | 29"/27.5" |
| Eff. seat tube angle | 77.4° | 77.4° | 77.4° | 77.4° | 77.2° | 77.2° | 77.2° | 77.2° | 77.5° | 77.5° | 77.5° | 77.4° | 77.4° | 77.4° |
| Front Center | 75.4 | 75.4 | 75.4 | 75.4 | 78.3 | 78.3 | 78.3 | 78.3 | 83.1 | 83.1 | 83.1 | 86.7 | 86.7 | 86.7 |
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.
