2025 Trek Bikes Top Fuel 8 S (High)
Build
650B/27.5 in × 2.4 in
Insights
Very aggressive stack and reach vs trend of full-suspension trail mtb bikes
Design deviates from other sizes of Trek Bikes Top Fuel
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 566mm |
| Reach | 422mm |
| Stack to Reach Ratio | 1.34:1 |
| Seat Tube Length, C-T | 360mm |
| Top Tube Length, Effective/Horizontal HT Top | 558mm |
| Top Tube Slope | 22.7deg |
| Head Tube Angle | 65.9deg |
| Seat Tube Angle | 69.5deg |
| Effective Seat Tube Angle, Unknown | 76.5deg |
| Head Tube Length | 105mm |
| Bottom Bracket Drop | 10mm |
| Bottom Bracket Height | 343mm |
| Chainstay Length | 434mm |
| Chainstay Length Horizontal | 433.9mm |
| Front-Center | 716.2mm |
| Front-Center Horizontal | 716.1mm |
| Wheelbase | 1150mm |
| Fork Offset/Rake | 44mm |
| Fork Length, Unknown | 541mm |
| Trail | 109.7mm very high |
| Mechanical Trail | 100.1mm |
| Wheel Flop | 40.9mm |
| Standover Height | 705mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 193.2mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 173mm |
8 Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 2.4in |
| Tire Outer Diameter | 705.9mm |
| Bike Length with Tires | 1855.9mm |
| Suspension Type | Full suspension |
| Bar Type | Flat Bar |
| Fork Travel | 130mm |
| Rear Travel | 120mm |
| Suspension Sag | Unknown |
| Frame Material | Unknown |
| Fork Material | Unknown |
| Brake Type | Unknown |
Published Sizing Recommendations
| Height | 155 cm to 165 cm |
Source:https://www.trekbikes.com/us/en_US/bikes/mountain-bikes/trail-mountain-bikes/top-fuel/top-fuel-8/p/46143/?colorCode=greenlight