Trek Top Fuel 9.8 XT Di2 Gen 4 Mountain Bike 2026 - Trail Full Suspension MTB
The Trek Top Fuel 9.8 XT Di2 Gen 4 is a high-performance full suspension trail bike built for riders who demand speed on the climbs, control on the descents and tech that works seamlessly every ride. With a full OCLV Mountain Carbon frame, this Top Fuel delivers precise handling and trail-ready strength, backed up with practical features like internal storage, downtube guard protection and Trek’s 4-way Mino Link system that lets you tweak geometry for your style of riding.
Key Features:
- OCLV Mountain Carbon frame with internal storage and 120 mm travel
- RockShox Pike Select+ fork, 130 mm travel
- RockShox Deluxe Ultimate rear shock, 120 mm travel
- Shimano XT Di2 12-speed electronic drivetrain
- Shimano XT M8200 4-piston hydraulic disc brakes
- 27.5" Bontrager Gunnison RSL XT tubeless-ready tyres
- Integrated internal storage and 4-way Mino Link geometry adjustment
- Available with 0% APR finance
Suspension is handled by RockShox’s proven Pike Select+ fork offering 130 mm of plush, supportive travel up front, paired with a Deluxe Ultimate RCT shock giving 120 mm of active rear suspension. This combo gives the Top Fuel confident traction and control through roots, rocks and tight technical sections, without compromising pedal efficiency.
At the heart of the build is the new Shimano XT Di2 wireless drivetrain. With 12 electronically controlled gears, shifting is smooth, lightning fast and unaffected by trail muck or cable wear. A 10-51T cassette ensures you’ve got the range to tackle steep climbs and open fire roads alike. Braking is handled by Shimano’s excellent XT M8200 4-piston brakes, offering consistent power and modulation on the longest descents.
Rolling on 27.5" Bontrager Gunnison RSL XT tyres, this bike is quick to accelerate and super agile through switchbacks and flow trails. The tyres are tubeless-ready with a supple 120 TPI construction and triple-compound rubber for balanced grip and rolling speed.
Whether you’re pushing the pace on local singletrack or chasing podiums at your next XC marathon, the Top Fuel 9.8 XT Di2 Gen 4 brings carbon performance and future-proof tech to every ride. And with 0% APR finance available, you can ride now and pay later.
Occasionally, without notice, manufacturers change product design and/or specifications.
| Frame | OCLV Mountain Carbon, internal storage, tapered head tube, internal guided routing, downtube guard, alloy rocker link, 4-way Mino Link, ABP, Boost148, 120 mm travel |
| Fork | RockShox Pike Select+, DebonAir spring, Charger 3.1 RC2 damper, tapered steerer, 44 mm offset, Boost110, 15 mm Maxle Stealth, 130 mm travel |
| Rear Shock | RockShox Deluxe Ultimate RCT, 185 mm x 50 mm |
| Stem | Bontrager Line Pro, 35 mm, Blendr-compatible, 0-degree, 35 mm length |
| Bars | Bontrager Line Pro, OCLV Carbon, 35 mm, 27.5 mm rise, 780 mm width |
| Front Brake | Shimano XT M8200 4-piston hydraulic disc // Shimano XT M8200 4-piston hydraulic disc |
| Rear Brake | Shimano XT M8200 4-piston hydraulic disc // Shimano XT M8200 4-piston hydraulic disc |
| Brake Lever | Shimano XT M8200 |
| Rear Mech | Shimano XT M8250, long cage |
| Shifters | Shimano XT Di2 M8250, 12-speed |
| Speed | 12 |
| Rims | Bontrager Line Comp 30, Tubeless Ready |
| Front Hub | Boost110, 15 mm thru-axle, |
| Rear Hub | Shimano MicroSpline freehub, Boost148, 12 mm thru-axle |
| Front Tyre | Bontrager Gunnison RSL XT, Tubeless-Ready, triple compound, aramid bead, 120 tpi, 27.5x2.40" |
| Rear Tyre | Bontrager Gunnison RSL XT, Tubeless-Ready, triple compound, aramid bead, 120 tpi, 27.5x2.40" |
| Seat Post | Bontrager Line Dropper, MaxFlow, internal routing, 34.9 mm |
| Saddle | Verse Short Comp, steel rails, 145 mm width |
| Chainset | Shimano XT 8200, 30T, 55 mm chain-line |
| Bottom Bracket | Shimano BB-MT501 BSA |
| Chain | Shimano XT M8100, 12-speed |
| Cassette | Shimano XT M8200, 10-51, 12-speed |
| Weight | 14.00 kg |
Trek Top Fuel Gen 4 Size Chart
| Size | Height cm | Height Feet / Inches | Inseam cm | Inseam Inches |
|---|---|---|---|---|
| XS | 145 - 155 cm | 4'9" - 5'1" | 69 - 73 cm | 27" - 29" |
| S | 155 - 165 cm | 5'1" - 5'5" | 74 - 78 cm | 29" - 31" |
| M | 165 - 176 cm | 5'5" - 5'9" | 79 - 83 cm | 31" - 33" |
| ML | 173 - 180 cm | 5'8" - 5'11" | 81 - 86 cm | 32" - 34" |
| L | 177 - 188 cm | 5'10" - 6'2" | 84 - 89 cm | 33" - 35" |
| XL | 188 - 195 cm | 6'2" - 6'5" | 89 - 91 cm | 35" - 36" |
What size frame do I need if I am between sizes? - read here
Trek Top Fuel Gen 4 Geometry Chart
| Size | M (High) | M (Low) | ML (High) | ML (Low) | L (High) | L (Low) | XL (High) | XL (Low) |
|---|---|---|---|---|---|---|---|---|
| Stack | 599 | 603 | 604 | 607 | 608 | 612 | 626 | 630 |
| Reach | 452 | 447 | 462 | 456 | 470 | 464 | 485 | 479 |
| Head Tube Length | 105 | 105 | 110 | 110 | 115 | 115 | 135 | 135 |
| Head Tube Angle | 65.9° | 65.5° | 65.9° | 65.5° | 65.9° | 65.5° | 65.9° | 65.5° |
| Bottom Bracket Drop | 26 | 32 | 26 | 32 | 26 | 32 | 26 | 32 |
| Fork Rake/Offset | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 43 |
| Trail | 121 | 125 | 121 | 125 | 121 | 125 | 121 | 125 |
| Chainstay Length | 434 | 435 | 439 | 440 | 440 | 440 | 444 | 445 |
| Wheelbase | 1188 | 1188 | 1210 | 1210 | 1227 | 1227 | 1270 | 1271 |
| Top Tube Length (horizontal) | 587 | 588 | 611 | 612 | 630 | 631 | 672 | 673 |
| Standover Height | 755 | 750 | 755 | 750 | 760 | 755 | 765 | 760 |
| Seat Tube Length | 410 | 410 | 420 | 420 | 435 | 435 | 470 | 470 |
| Seat Tube Angle | 70.5° | 70.0° | 70.5° | 70.0° | 70.5° | 70.0° | 70.5° | 70.0° |
| Effective Seat Tube Angle | 77.3° | 76.9° | 76.6° | 76.2° | 76.3° | 75.9° | 75.6° | 75.2° |
All measurements are in mm unless otherwise stated.
The above table shows the standard geometry for the bicycle as shipped, other geometry configurations may be available with certain bikes. Please contact us via Live Chat to find out more.
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Trek Top Fuel 9.8 XT Di2 Gen 4 Mountain Bike 2026 - Trail Full Suspension MTB
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