Trek Session AL Frameset
Description
- New suspension layout with a high pivot and idler pulley increases traction, carries more speed, and reduces pedal kickback for more stability
- Virtually zero pedal kickback means you’ll stay confidently planted and in control during descents—especially when landing jumps or drops
- The high pivot design delivers a more efficient rearward axle path so you’ll carry more speed and your wheel won’t get hung up on obstacles
- The Marzocchi coil shock delivers a supple feel with minimal stiction and consistent performance on long, rowdy descents
- Our new DH sizing system is based on reach, not rider height, which is the most important factor in a great downhill bike fit
Tech Specs
| Frame | Alpha Platinum Aluminum, high main pivot, idler pulley, integrated frame protection, internal or external routing, magnesium rocker link, Mino Link, ISCG 05 2-bolt mount, Active Braking Pivot, 157x12mm thru axle, 200mm travel |
| Shock | Marzocchi Bomber, 500lb spring, 250mm x 72.5mm |
| Skewer Rear | Bontrager Switch thru axle, removable lever |
| Seat Collar | Bolt-on, 36.4mm |
| Headset | FSA Orbit, sealed cartridge bearing, 1-1/8'' top, 1.5'' bottom (includes geometry adjust angled cups) |
Product Identifiers
| Brand | Trek |
| Type | Mountain Bike |
| SKU | 5288400 |
| UPC | 745889027563 |
| MPN | 5288400 |
All speed, no hang-ups
Session’s high-pivot design results in a rearward axle path that lets the back wheel move with the rearward force from bumps, not against it. On the trail, it feels like smoother suspension that maintains more forward momentum and provides more grip.
Rock the mullet
Session comes stocked for speed with 29er wheels, but party-in-the-back riders can run a mixed set up with a 27.5˝ rear wheel, or even 27.5" front and rear for more agility.
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 | 1.2 |
| B B Height | 35.9 |
| Chainstay Length | 44.8 |
| Eff Seat Tube Angle | 77.1° |
| Eff Top Tube | 65.2 |
| Frame Reach | 49.9 |
| Frame Size Letter | R3 |
| Frame Stack | 63.4 |
| Head Angle | 63.6° |
| Head Tube Length | 11.7 |
| Offset | 4.6 |
| Position | High |
| Seat Tube | 42.5 |
| Seat Tube Angle | 61.6° |
| Standover | 75.7 |
| Trail | 13.2 |
| Wheelbase | 130.9 |
| Wheel Size | 29" |