2020 Trek Bikes Top Fuel 8 XL/21.5 Low
Build
700C/29 in × 2.4 in
Insights
Average stack and reach vs trend of full-suspension cross-country 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 | 612mm |
| Reach | 487mm |
| Stack to Reach Ratio | 1.26:1 |
| Seat Tube Length, C-T | 521mm |
| Top Tube Length, Effective/Horizontal HT Top | 651mm |
| Top Tube Slope | 9.9deg |
| Head Tube Angle | 67.5deg |
| Seat Tube Angle | 75deg |
| Head Tube Length | 110mm |
| Bottom Bracket Drop | 36mm |
| Bottom Bracket Height | 336mm |
| Chainstay Length | 435mm |
| Chainstay Length Horizontal | 433.5mm |
| Front-Center | 774.3mm |
| Front-Center Horizontal | 773.5mm |
| Wheelbase | 1207mm |
| Fork Offset/Rake | 44mm |
| Trail | 106.5mm very high |
| Mechanical Trail | 98.3mm |
| Wheel Flop | 37.6mm |
| Standover Height | 765mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 232.4mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 166mm |
8 Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 2.4in |
| Tire Outer Diameter | 743.9mm |
| Bike Length with Tires | 1950.9mm |
| Stem Length | 7cm |
| Suspension Type | Full suspension |
| Bar Type | Flat Bar |
| Fork Travel | 120mm |
| Rear Travel | Unknown |
| Suspension Sag | Unknown |
| Frame Material | Aluminum |
| Fork Material | Unknown |
| Brake Type | Disc |
Published Sizing Recommendations
| Height | 186 cm to 196 cm |
| PBH | 87 cm to 92 cm |
Source:https://www.trekbikes.com/us/en_US/bikes/mountain-bikes/cross-country-mountain-bikes/top-fuel/top-fuel-8/p/28012/?colorCode=black_red