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Designed to go fast everywhere, the Gen 4 Trek Top Fuel 9.8 XT Di2 combines an OCLV Mountain carbon frame, a Shimano XT Di2 drivetrain and triple-compound Bontrager RSL tyres, weighing 14.00 kg in size M. It offers 120 mm of rear travel and 130 mm at the front, with a dropper post that reaches 200 mm in L and XL. Its Matte Sedona Red/Pennyflake paint combines a matt earth red with coppery orange highlights, like the soils of the Salagou.
| Frame | OCLV Mountain carbon, internal storage, 4-position Mino Link, ABP, down tube protection, Boost148, 120-130 mm |
| Suspension | RockShox Pike Select+ Charger 3.1 RC2, 130 mm / RockShox Deluxe Ultimate RCT 185x50 mm |
| Drivetrain | Shimano XT Di2 M8250 1x12, XT M8200 10-51 cassette, XT 30T chainset |
| Brakes | Shimano XT M8220 4-piston, RT86 180 mm rotors |
| Wheels / tyres | Bontrager Line Comp 30 / Gunnison RSL XT front, Montrose RSL XT rear 2.40 (27.5 in S) |
| Cockpit | Bontrager Line Pro carbon 780 mm handlebar, Line Pro 35 mm stem |
| Saddle / seatpost | Verse Short Comp / Line Dropper from 100 to 200 mm depending on size |
| Weight | 14.00 kg in size M (Trek figure, with tubeless sealant) |
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At a glance
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For the tall, sporty rider who wants a bike that is fast on the link sections and safe on the descents, with no compromise on the dropper post. It will also appeal to riders on regional MTB sportives who like to ride at the front and finish fresh.
OCLV Mountain carbon, the happy medium. The Top Fuel 9.8 is the first carbon model of the 4th generation. The OCLV Mountain layup is designed to withstand mountain bike impacts, and the frame keeps everything that makes a Top Fuel: internal storage, four-position Mino Link and ABP pivot. Trek's lifetime warranty covers the frame.
| OCLV Mountain (Top Fuel 9.x) | Alpha Platinum (Top Fuel 8) | Alpha Platinum (Top Fuel 5, Gen 3) | |
| Level | Trek's mountain bike carbon | High-end aluminium | Same alloy, previous generation |
| Construction | OCLV layup tuned to absorb impacts | Hydroformed tubes, smoothed welds | Gen 3 frame, Knock Block 2.0 |
| Reference bike | Top Fuel 9.8 XT Di2: 14.00 kg (M) | Top Fuel 8: 14.58 kg (M) | Top Fuel 5: 15.60 kg (M) |
| What it means | Sharper acceleration, lifetime frame warranty | Tough, less worrying in a crash | Entry into lightweight full-suspension trail riding |
Put simply: a round 14 kg in size M, for a build that does not cut corners on reliability. Moving to carbon plus Di2 saves you 580 g over the aluminium Top Fuel 8.
The Gunnison RSL front and Montrose RSL rear tyres use three compounds: a fast-rolling centre tread and softer side knobs for grip in corners. On the red earth and stones of the Salagou, it is the ideal compromise between efficiency and grip.
The 200 mm Line Dropper post in L and XL lets you drop the saddle completely out of the way on steep sections, something bikes in this category often lack. The carbon frame keeps the internal storage for an inner tube and tools, handy on long rides without a pack.
| Model | Frame | Travel rear / front | Drivetrain | Weight (M) |
| Top Fuel 8 | Alpha Platinum alloy | 120 / 130 mm | Shimano SLX/XT 1x12 | 14.58 kg |
| Top Fuel 9.8 XT Di2 | OCLV Mountain carbon | 120 / 130 mm | Shimano XT Di2 1x12 | 14.00 kg |
| Top Fuel 9.9 XTR Di2 | OCLV Mountain carbon | 120 / 130 mm | Shimano XTR Di2 1x12 | 13.10 kg |
| Top Fuel 9.9 XX AXS | OCLV Mountain carbon | 120 / 130 mm | SRAM XX AXS T-Type 1x12 | 12.85 kg |
Our take: with the same frame, the 9.9 XTR Di2 saves 900 g thanks to its components. Compared with the aluminium Top Fuel 8, this 9.8 offers electronics, RSL tyres and 580 g less.
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LVR sizing advice From S to XL: the S rolls on 27.5-inch wheels, the other sizes on 29. The dropper post grows with the frame, from 100 mm in S up to 200 mm in L and XL; a real bonus for tall riders.
Source: Trek size guide. Bike fitting available in our Béziers shop. |
| A 200 mm post in L? | Yes, in L and XL; 170 mm in M and ML, 100 mm in S. |
| Do the RSL tyres wear quickly? | The soft side compound wears a little faster; we check wear at every service. |
| Di2 updates? | We update the firmware in the workshop and configure the controls to your liking. |
| What about the red and orange paint? | Matte Sedona Red/Pennyflake is matt with copper flakes; clean it gently. |
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The LVR Cycles verdict A fast carbon Top Fuel, generous with its dropper post and well shod. Its matt earth red and coppery highlights make it one of the most beautiful colours in the range.
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Why buy from LVR Cycles? In Béziers, we set up your Top Fuel tubeless, update the Di2 and set up the RockShox suspension before your first ride.
Please note that the specifications may be changed without prior notice by the manufacturer, based on the availability of components and other factors.
Data sheet
Specific References