2025 Trek Bikes Top Fuel 8
- Category
- Full-suspension Trail MTB
- Design
- Flat Bar, Full suspension
- Suspension
- 130mm fork travel, 120mm rear travel
Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Very aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Average stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry |
Geometry
S (Low) | S (High) | M (Low) | M (High) | ML (Low) | ML (High) | L (Low) | L (High) | XL (Low) | XL (High) | |
Stack | 570mm | 566mm | 603mm | 599mm | 607mm | 604mm | 612mm | 608mm | 630mm | 626mm |
Reach | 417mm | 422mm | 447mm | 452mm | 462mm | 467mm | 477mm | 482mm | 507mm | 512mm |
Stack to Reach Ratio | 1.37:1 | 1.34:1 | 1.35:1 | 1.33:1 | 1.31:1 | 1.29:1 | 1.28:1 | 1.26:1 | 1.24:1 | 1.22:1 |
Seat Tube Length, C-T | 360mm | 360mm | 410mm | 410mm | 420mm | 420mm | 435mm | 435mm | 470mm | 470mm |
Top Tube Length, Effective/Horizontal HT Top | 559mm | 558mm | 588mm | 587mm | 612mm | 611mm | 631mm | 630mm | 673mm | 672mm |
Top Tube Slope | 23.2deg | 22.7deg | 20.3deg | 19.8deg | 19.3deg | 18.9deg | 18deg | 17.5deg | 15.8deg | 15.3deg |
Head Tube Angle | 65.5deg | 65.9deg | 65.5deg | 65.9deg | 65.5deg | 65.9deg | 65.5deg | 65.9deg | 65.5deg | 65.9deg |
Seat Tube Angle | 69deg | 69.5deg | 70deg | 70.5deg | 70deg | 70.5deg | 70deg | 70.5deg | 70deg | 70.5deg |
Effective Seat Tube Angle, Unknown | 76deg | 76.5deg | 76.9deg | 77.3deg | 76.2deg | 76.6deg | 75.9deg | 76.3deg | 75.2deg | 75.6deg |
Head Tube Length | 105mm | 105mm | 105mm | 105mm | 110mm | 110mm | 115mm | 115mm | 135mm | 135mm |
Bottom Bracket Drop | 16mm | 10mm | 32mm | 26mm | 32mm | 26mm | 32mm | 26mm | 32mm | 26mm |
Bottom Bracket Height | 337mm | 343mm | 340mm | 346mm | 340mm | 346mm | 340mm | 346mm | 340mm | 346mm |
Chainstay Length | 435mm | 434mm | 435mm | 434mm | 440mm | 439mm | 440mm | 439mm | 445mm | 444mm |
Chainstay Length Horizontal | 434.7mm | 433.9mm | 433.8mm | 433.2mm | 438.8mm | 438.2mm | 438.8mm | 438.2mm | 443.9mm | 443.2mm |
Front-Center | 716.5mm | 716.2mm | 754.9mm | 755.2mm | 771.8mm | 772.2mm | 788.8mm | 789.2mm | 827.8mm | 827.2mm |
Front-Center Horizontal | 716.3mm | 716.1mm | 754.2mm | 754.8mm | 771.2mm | 771.8mm | 788.2mm | 788.8mm | 827.2mm | 826.8mm |
Wheelbase | 1151mm | 1150mm | 1188mm | 1188mm | 1210mm | 1210mm | 1227mm | 1227mm | 1271mm | 1270mm |
Fork Offset/Rake | 44mm | 44mm | 44mm | 44mm | 44mm | 44mm | 44mm | 44mm | 44mm | 44mm |
Fork Length, Unknown | 541mm | 541mm | 541mm | 541mm | 541mm | 541mm | 541mm | 541mm | 541mm | 541mm |
Trail | 112.5mm very high | 109.7mm very high | 121.2mm very high | 118.2mm very high | 121.2mm very high | 118.2mm very high | 121.2mm very high | 118.2mm very high | 121.2mm very high | 118.2mm very high |
Mechanical Trail | 102.4mm | 100.1mm | 110.3mm | 107.9mm | 110.3mm | 107.9mm | 110.3mm | 107.9mm | 110.3mm | 107.9mm |
Wheel Flop | 42.5mm | 40.9mm | 45.7mm | 44.1mm | 45.7mm | 44.1mm | 45.7mm | 44.1mm | 45.7mm | 44.1mm |
Standover Height | 700mm | 705mm | 750mm | 755mm | 752mm | 757mm | 753mm | 758mm | 758mm | 763mm |
Tire to Pedal Spindle | 193.5mm 170 mm cranks | 193.2mm 170 mm cranks | 212.9mm 170 mm cranks | 213.3mm 170 mm cranks | 229.9mm 170 mm cranks | 230.3mm 170 mm cranks | 246.9mm 170 mm cranks | 247.2mm 170 mm cranks | 285.8mm 170 mm cranks | 285.2mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 167mm 170 mm cranks | 173mm 170 mm cranks | 170mm 170 mm cranks | 176mm 170 mm cranks | 170mm 170 mm cranks | 176mm 170 mm cranks | 170mm 170 mm cranks | 176mm 170 mm cranks | 170mm 170 mm cranks | 176mm 170 mm cranks |
8 Build
S (Low) | S (High) | M (Low) | M (High) | ML (Low) | ML (High) | L (Low) | L (High) | XL (Low) | XL (High) | |
Wheel Size | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 2.4in | 2.4in | 2.4in | 2.4in | 2.4in | 2.4in | 2.4in | 2.4in | 2.4in | 2.4in |
Tire Outer Diameter | 705.9mm | 705.9mm | 743.9mm | 743.9mm | 743.9mm | 743.9mm | 743.9mm | 743.9mm | 743.9mm | 743.9mm |
Bike Length with Tires | 1856.9mm | 1855.9mm | 1931.9mm | 1931.9mm | 1953.9mm | 1953.9mm | 1970.9mm | 1970.9mm | 2014.9mm | 2013.9mm |
Published Sizing Recommendations
Height | 155 cm to 165 cm | 155 cm to 165 cm | 165 cm to 176 cm | 165 cm to 176 cm | 173 cm to 180 cm | 173 cm to 180 cm | 177 cm to 188 cm | 177 cm to 188 cm | 188 cm to 195 cm | 188 cm to 195 cm |
Stack and Reach vs. Category Trend
Very Upright
Somewhat Upright
Average
Somewhat Aggressive
Very Aggressive
The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.
Learn more about the Upright/Aggressive ScaleCategory Trend
Full-suspension Trail MTBSource:https://www.trekbikes.com/us/en_US/bikes/mountain-bikes/trail-mountain-bikes/top-fuel/top-fuel-8/p/46143/?colorCode=greenlight