2025 Trek Bikes Session 8 R3(H)
Build
700C/29 in × 2.5 in
Insights
Average 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 | 634mm |
| Reach | 499mm |
| Stack to Reach Ratio | 1.27:1 |
| Seat Tube Length, C-T | 425mm |
| Top Tube Length, Effective/Horizontal HT Top | 652mm |
| Head Tube Angle | 63.6deg |
| Effective Seat Tube Angle, ETT HT Top | 77.1deg |
| Head Tube Length | 117mm |
| Bottom Bracket Drop | 12mm |
| Bottom Bracket Height | 362.5mm |
| Chainstay Length | 448mm |
| Chainstay Length Horizontal | 447.8mm |
| Front-Center | 861.2mm |
| Front-Center Horizontal | 861.2mm |
| Wheelbase | 1309mm |
| Fork Offset/Rake | 46mm |
| Trail | 134.6mm very high |
| Mechanical Trail | 120.5mm |
| Wheel Flop | 53.6mm |
| Standover Height | 757mm |
| Tire to Pedal Spindle Distance With 165 mm cranks | 321.7mm |
| Pedal Spindle to Ground Clearance With 165 mm cranks | 197.5mm |
8 Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 2.5in |
| Tire Outer Diameter | 749mm |
| Bike Length with Tires | 2058mm |
| 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 | 186 cm to 196 cm |
Source:https://www.trekbikes.com/us/en_US/bikes/mountain-bikes/downhill-mountain-bikes/session/session-8-29-gx/p/37056/