Trek Top Fuel 8 XT Gen 3

By Trek
$3,999.99
SKU: 5275064 // Barcode: 768682513521
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Top Fuel 8 fuses the speed of a cross country bike with the capability and forgiveness of a full suspension trail bike. Its quick, nimble, and dishes out serious fun on flow trails and techy descents alike.
  • This bike’s killer suspension setup is both efficient and ready to party
  • You get wide Bontrager Line Comp 30 wheels that boost grip and reduce flats with their tubeless setup
  • Mino Link lets you make small adjustments to your geometry quickly and easily, even mid-ride
  • A sleek internal storage compartment gives you a versatile spot to stow tools and gear
  • New, removable Knock Block has a bigger steering angle to keep cables and hoses safe without sacrificing turning radius

Active Braking Pivot

Active Braking Pivot allows our engineers to tune how the suspension reacts to acceleration and braking forces independently. That means you get more confident control when you need it most.

Quick and in control

120mm of rear travel combined with progressive trail geometry gives you a fast, responsive ride that helps you keep your cool when the trail turns rowdy.

Internal Storage

Internal frame storage makes it easy to ditch the pack and still carry your ride essentials.

Hassle-free routing

Guided internal cable routing keeps Top Fuel quiet on the trail and maintenance a breeze.

Will my bike have a curved top tube?

Smaller frames (XS and S) have a curved top tube. This design makes for a lower standover height, which allows shorter riders to straddle the bike more easily. Larger frames (M and up) have a straight top tube because taller riders with longer legs typically dont have the same issues with standover height.

Shimano XT

Shimano XT is the original mountain bike groupset and trusted by generations of mountain bikers around the world. Whatever the trail, wherever you ride, XT is your solution for mountain biking today. Reliable shifting. Superior braking. Intuitive maintenance. XT is the high performance workhorse you can count on.


Frame Alpha Platinum Aluminum, internal storage, tapered head tube, Knock Block 2.0, internal guided routing, downtube guard, magnesium rocker link, Mino Link, ABP, Boost148, 120mm travel
Fork RockShox Pike, DebonAir spring, Rush RC damper, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 130mm travel
Shock RockShox Deluxe Ultimate RCT, 185mm x 50mm
Wheel Front Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 29 /
Wheel Rear Bontrager Line Comp 30, High Strength 6000 Series Aluminum rim, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano MicroSpline freehub, Boost148, 12mm thru axle, 29
Tire Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120tpi, 29x2.40
Tire Part Bontrager TLR sealant, 6oz
Rim Strip Bontrager TLR
Shifter Shimano XT M8100, 12 speed
Rear Derailleur Shimano XT M8100, long cage
Crank Shimano Deore M6120, 30T ring, 55mm chainline, 170mm length
Bottom Bracket Shimano BB-MT501 BSA
Cassette Shimano SLX M7100, 10-51T, 12 speed
Chain Shimano SLX M7100, 12 speed
Brake Shimano M6120 4-piston hydraulic disc // Shimano 4-piston hydraulic disc, M6100 lever, M6120 caliper
Brake Rotor Shimano RT66, 6-bolt, 180mm
Saddle Bontrager Arvada, steel rails, 138mm width
Handlebar Bontrager Line, alloy, 35mm, 27.5mm rise, 750mm width
Stem Bontrager Elite, 35mm, 0 degree, 45mm length
Headset Knock Block 2.0 Integrated, 72-degree radius (includes infinite-radius chip), sealed cartridge bearing, 1-1/8 top, 1.5 bottom
Grips Bontrager XR Trail Comp, nylon lock-on

Geometry Chart

SMMLLXLXXL
B B Drop 2.7
B B Height 34.6
Chainstay Length 43.4
Eff Seat Tube Angle 75.9°
Eff Top Tube 56.9
Frame Reach 41.9
Frame Size Letter S
Frame Size Number 15.5"
Frame Stack 59.6
Head Angle 65.9°
Head Tube Length 10
Offset 4.3
Position High
Seat Tube 39.5
Seat Tube Angle 69.9°
Standover 72.4
Trail 12
Wheelbase 115.3
Wheel Size 29"
B B Drop 2.7
B B Height 34.6
Chainstay Length 43.4
Eff Seat Tube Angle 75.9°
Eff Top Tube 59.9
Frame Reach 44.9
Frame Size Letter M
Frame Size Number 17.5"
Frame Stack 59.6
Head Angle 65.9°
Head Tube Length 10
Offset 4.3
Position High
Seat Tube 42
Seat Tube Angle 69.9°
Standover 74.4
Trail 12
Wheelbase 118.3
Wheel Size 29"
B B Drop 2.7
B B Height 34.6
Chainstay Length 43.4
Eff Seat Tube Angle 75.9°
Eff Top Tube 61.5
Frame Reach 46.4
Frame Size Letter ML
Frame Size Number 18.5"
Frame Stack 60
Head Angle 65.9°
Head Tube Length 10.5
Offset 4.3
Position High
Seat Tube 43.5
Seat Tube Angle 69.9°
Standover 74.9
Trail 12
Wheelbase 120
Wheel Size 29"
B B Drop 2.7
B B Height 34.6
Chainstay Length 43.4
Eff Seat Tube Angle 75.9°
Eff Top Tube 63.1
Frame Reach 47.9
Frame Size Letter L
Frame Size Number 19.5"
Frame Stack 60.5
Head Angle 65.9°
Head Tube Length 11
Offset 4.3
Position High
Seat Tube 45
Seat Tube Angle 69.9°
Standover 75.4
Trail 12
Wheelbase 121.7
Wheel Size 29"
B B Drop 2.7
B B Height 34.6
Chainstay Length 43.4
Eff Seat Tube Angle 75.9°
Eff Top Tube 65.4
Frame Reach 49.9
Frame Size Letter XL
Frame Size Number 21.5"
Frame Stack 61.9
Head Angle 65.9°
Head Tube Length 12.5
Offset 4.3
Position High
Seat Tube 50
Seat Tube Angle 69.9°
Standover 76.4
Trail 12
Wheelbase 124.4
Wheel Size 29"
B B Drop 2.7
B B Height 34.6
Chainstay Length 43.4
Eff Seat Tube Angle 69.9°
Eff Top Tube 67.7
Frame Reach 51.9
Frame Size Letter XXL
Frame Size Number 23.0"
Frame Stack 63
Head Angle 65.9°
Head Tube Length 13.5
Offset 4.3
Position High
Seat Tube 54
Seat Tube Angle 75.9°
Standover 76.4
Trail 11.2
Wheelbase 126.8
Wheel Size 29"