2025 Trek Bikes Session 8 R1(L)
Build
700C/29 in × 2.5 in
Insights
Somewhat upright stack and reach vs trend of full-suspension downhill/freeride mtb bikes
Design deviates from other sizes of Trek Bikes Session
Bar type unusual for category
This: Moto/Klunker/Riser Bar
Category: Flat Bar
vs full-suspension downhill/freeride mtb bikesCategory: Flat Bar
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 639mm |
| Reach | 440mm |
| Stack to Reach Ratio | 1.45:1 |
| Seat Tube Length, C-T | 425mm |
| Top Tube Length, Effective/Horizontal HT Top | 587mm |
| Head Tube Angle | 63deg |
| Effective Seat Tube Angle, ETT HT Top | 76.5deg |
| Head Tube Length | 117mm |
| Bottom Bracket Drop | 21mm |
| Bottom Bracket Height | 353.5mm |
| Chainstay Length | 439mm |
| Chainstay Length Horizontal | 438.5mm |
| Front-Center | 807.8mm |
| Front-Center Horizontal | 807.5mm |
| Wheelbase | 1246mm |
| Fork Offset/Rake | 46mm |
| Trail | 139.2mm very high |
| Mechanical Trail | 124mm |
| Wheel Flop | 56.3mm |
| Standover Height | 747mm |
| Tire to Pedal Spindle Distance With 165 mm cranks | 268.3mm |
| Pedal Spindle to Ground Clearance With 165 mm cranks | 188.5mm |
8 Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 2.5in |
| Tire Outer Diameter | 749mm |
| Bike Length with Tires | 1995mm |
| Crank Length | 165mm |
| Handlebar Width | 780mm |
| Stem Length | 50mm |
| Stem Angle | 0deg |
| Suspension Type | Full suspension |
| Bar Type | Moto/Klunker/Riser Bar |
| Fork Travel | 200mm |
| Rear Travel | 200mm |
| Suspension Sag | 20% |
| Frame Material | Aluminum |
| Fork Material | N/A |
| Brake Type | Disc |
Published Sizing Recommendations
| Height | 161 cm to 175 cm |
Source:https://www.trekbikes.com/us/en_US/bikes/mountain-bikes/downhill-mountain-bikes/session/session-8-29-gx/p/37056/