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  • Top Fuel 8
2019

Top Fuel 8

/
$3,149.99 Model 23639

Top Fuel 8 is a high-performance, high-value full suspension cross country mountain bike. It's built for speed and efficiency in rough singletrack and XC races. A lightweight Alpha Aluminum frame, a 1x12 drivetrain, and Tubeless Ready wheels make it a great choice for new racers, fast singletrack riders, and anyone who wants to ride fast on trails without breaking the bank.

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It's right for you if...

You're new to XC mountain biking and want the speed and efficiency of a full suspension bike. Or, you want an upgrade in performance over your hardtail and want a serious amount of smart racer spec for your money.

The tech you get

A lightweight Alpha Platinum Aluminum frame, a 100mm RockShox Recon RL fork, FOX rear shock, and a TwistLoc dual remote suspension lockout. Plus, a 1x12 SRAM NX Eagle drivetrain, Shimano MT500 hydraulic disc brakes, and Boost148/110 Tubeless Ready Bontrager Kovee Comp 23 wheels.

The final word

Top Fuel 8 is a performance full suspension XC bike at a great value. A lightweight aluminum frame, a great suspension package, and a solid parts group add up to a fast ride that can't be beaten for this price.

favorite_borderWhy you'll love it

  1. Top Fuel 8 gets you into the world of fast XC riding and racing at a great value
  2. More than fast, it's also capable: Top Fuel 8 is great for racing and can double as a light trail bike on more rugged terrain
  3. TwistLoc simultaneously locks out front and rear shocks for climbs and sprints with the simple Grip Shift-like motion
  4. Internal cable routing opens the door for upgrades like a dropper post

"An XC racer's dream bike"

"A no-compromise XC race bike aimed at the go-fast everywhere (not just go-fast downhill) crowd. This bike is made to go fast, and that's what it does best. Don't be afraid to get sendy on this bike, either, it amazes with what it can handle. This thing feels stable in the air and the suspension helped make landings seamless and smooth."

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"More than just race-winning performance"

"It's a seriously rapid bike, and it responds well to roots and rocks, allowing you to keep the power on rather than having to ease back. It manages a fine line between a taut and lithe XC race machine and a bike that most riders would be happy to use for general trail duty."

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"A greyhound tailor-made for marathon racers and long distances"

"Few testers were surprised when they pulled away from their counterparts on the opening climb of our test track. Nor were any eyebrows raised when the big wheels blazed over root-filled, technical ascents. The small-bump compliance is superb. It feels like it has more than 100mm of travel. It motors the flats and climbs like a scalded cat."

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Features

Suspension Calculator

This suspension calculator will help you optimize your suspension settings for your riding weight. Simply follow the steps to find your best set up.

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ABP

Our patented Active Braking Pivot allows your suspension to work freely whether you’re on the brakes or off. It’s smooth, controlled suspension that’s at its best all the time.

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Mino Link adjustable geometry

Fine tune head tube angle by 1/2° and BB height by up to 10mm with the simple turn of a nut. Just flip the link to choose between slack or slacker geometry, without negatively affecting suspension performance. A Trek exclusive.

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TwistLoc Dual Remote Lockout

TwistLoc simultaneously locks out front and rear shocks with a simple Grip Shift-like motion; and it leaves room for a dropper post lever.

Control Freak Cable Management

The lightest, quietest, most versatile cable management system allows any combination of shift, brake, lockout, and dropper post lines to be routed through the frame for clean looks and the ultimate custom setup.

Alpha Platinum Aluminum

Our premium lightweight aluminum is continuously cold extruded and butted at multiple points, and hydroformed into sophisticated tube shapes for maximum strength and minimum weight.

Smart Wheel Size

The right wheel size paired with your frame size gives you the perfect combination of responsiveness and control.

G2 Geometry

Advanced frame geometry and a custom offset fork give our 29ers precise handling at low speed without compromising high-speed stability. We call it G2 Geometry, and it's why our 29ers handle better than anyone's.

Specifications

  • Frameset

    Frame
    Alpha Platinum Aluminum, ABP, Full Floater, EVO link, tapered head tube, Mino Link, MicroTruss, internal derailleur and dropper post routing, down tube guard, PF92, Boost148, G2 Geometry on 29ers, 100mm travel
    Fork
    RockShox Recon RL, Solo Air, Motion Control damper, TwistLoc remote lockout, tapered steerer, Boost110, G2 Geometry w/51mm offset on 29ers, 100mm travel
    Rear suspension
    Fox Performance Float DPS, 2-position remote, tuned by Trek Suspension Lab, 6.5x1.5˝

  • Wheels

    Wheels
    Bontrager Kovee Comp 23, Tubeless Ready, Boost110 front, Boost148 rear, tubeless strips included, valves sold separately
    Tires
    Bontrager XR2 Team Issue, Tubeless Ready, 120 tpi, aramid bead, 29x2.20˝ (13.5 & 15.5: 27.5x2.20˝)

  • Drivetrain

    Shifters
    SRAM NX Eagle, 12 speed
    Rear derailleur
    SRAM NX Eagle
    Crank
    SRAM NX Eagle DUB, 32T Direct Mount
    Bottom bracket
    SRAM DUB Press Fit, 92mm
    Cassette
    SRAM XG-1230 Eagle, 11-50, 12 speed
    Chain
    SRAM NX Eagle
    Pedals
    Not included

  • Components

    Saddle
    Bontrager Montrose Comp
    Seatpost
    Bontrager Rhythm Elite, 31.6mm, 0mm offset
    Handlebar
    Bontrager alloy, 31.8mm, 5mm rise, 720mm width
    Stem
    Bontrager Elite, 31.8mm, 7 degree
    Headset
    FSA IS-2, 1-1/8˝ top, 1.5˝ bottom
    Brakeset
    Shimano MT500 hydraulic disc

  • Weight

    Weight
    M - 12.70 kg / 28 lbs (with tubes)
    Weight limit
    This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg).
We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colors, and materials.
Bike and frame weights are based off Trek pre-production painted frames at time of publication. Weights may vary in final production.

Sizing & fit

The charts below show our recommended sizes based on height, but there are some other factors, like arm and leg length, that determine a great fit. That’s why you’ll see some overlap in our recommendations. Not every rider who’s 5´8˝, for example, will fit on the same size bike. The best way to find your perfect fit is to consult the experts at your local Trek retailer.

 

Rider Height

Inseam

All measurements provided in cm unless otherwise noted.

Frame size number Frame size letter Geometry position Wheel size A — Seat tube B — Seat tube angle Effective seat tube angle C — Head tube length D — Head angle E — Effective top tube F — Bottom bracket height G — Bottom bracket drop H — Chainstay length I — Offset J — Trail K — Wheelbase L — Standover M — Frame reach N — Frame stack
15.5 in S Low 27.5" 39.4 69.5° 73.5° 10.0 69.9° 55.8 33.0 2.5 42.7 4.7 8.0 106.4 73.2 39.2 56.1
15.5 in S High 27.5" 39.4 70.5° 74.4° 10.0 70.9° 55.6 34.1 1.4 42.4 4.7 7.3 106.3 74.1 40.1 55.4
17.5 in M Low 29" 41.9 68.5° 74.0° 9.0 70.0° 59.3 33.0 3.9 43.5 5.1 8.0 111.1 72.4 42.7 57.7
17.5 in M High 29" 41.9 69.4° 74.9° 9.0 70.9° 59.3 34.1 2.8 43.2 5.1 7.4 110.9 73.4 43.6 57.0
18.5 in ML High 29" 44.5 69.4° 74.9° 9.0 70.9° 60.6 34.1 2.8 43.2 5.1 7.4 112.5 72.9 45.2 57.0
18.5 in ML Low 29" 44.5 68.5° 74° 9.0 70.0° 60.9 33.0 3.9 43.5 5.1 8.0 112.7 71.9 44.3 57.7
19.5 in L Low 29" 47.0 68.5° 74.0° 10.0 70.0° 62.5 33.0 3.9 43.5 5.1 8.0 114.4 71.9 45.7 58.7
19.5 in L High 29" 47.0 69.4° 74.9° 10.0 70.9° 62.3 34.1 2.7 43.2 5.1 7.4 114.3 72.9 46.6 58.0
21.5 in XL Low 29" 49.5 68.5° 74.0° 12.0 70.0° 64.6 33.0 3.9 43.5 5.1 8.0 116.6 71.9 47.2 60.6
21.5 in XL High 29" 49.5 69.4° 74.9° 12.0 70.9° 64.6 34.1 2.7 43.2 5.1 7.4 116.5 72.9 48.1 59.8

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