2026 Trek Bikes Roscoe 8 Gen 4 S
Build
650B/27.5 in × 2.4 in
Insights
Average stack and reach vs trend of hardtail trail mtb bikes
Design deviates from other sizes of Trek Bikes Roscoe
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 604mm |
| Reach | 415mm |
| Stack to Reach Ratio | 1.46:1 |
| Seat Tube Length, C-T | 330mm |
| Top Tube Length, Effective/Horizontal Center | 575mm |
| Top Tube Slope | 29.4deg |
| Head Tube Angle | 65deg |
| Seat Tube Angle | 73.1deg |
| Seat Tube Exit Angle | 75deg |
| Head Tube Length | 90mm |
| Bottom Bracket Drop | 45mm |
| Bottom Bracket Height | 308mm |
| Chainstay Length | 425mm |
| Chainstay Length Horizontal | 422.6mm |
| Front-Center | 717.8mm |
| Front-Center Horizontal | 716.4mm |
| Wheelbase | 1139mm |
| Fork Offset/Rake | 37mm |
| Trail | 123.8mm very high |
| Mechanical Trail | 112.2mm |
| Wheel Flop | 47.4mm |
| Standover Height | 714mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 194.8mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 138mm |
8 Gen 4 Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 2.4in |
| Tire Outer Diameter | 705.9mm |
| Bike Length with Tires | 1844.9mm |
| Crank Length | 170mm |
| Suspension Type | Hardtail (Front suspension) |
| Bar Type | Flat Bar |
| Fork Travel | 150mm |
| Suspension Sag | Unknown |
| Frame Material | Aluminum |
| Fork Material | Unknown |
| Brake Type | Disc |
Source:https://www.trekbikes.com/us/en_US/bikes/mountain-bikes/trail-mountain-bikes/roscoe/f/F342/roscoe-8-gen-4/59872/5341548