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On the Trek Fuel LX 9.9 X0 AXS Gen 7, the SRAM X0 Eagle AXS T-Type drivetrain and the Fox Transfer NEO dropper are both wireless, built around an OCLV Mountain carbon frame with 160 mm of travel and a 170 mm RockShox ZEB Ultimate fork. As for the weight of this version, Trek has not published it; take as a reference the Fuel LX 9.8 XT Di2, identical carbon frame, at 15.97 kg in a size M. The Gloss Dark Carmine/Matte Trek Black livery pairs a glossy dark carmine with a matte black.
| Frame | OCLV Mountain carbon, integrated storage, adjustable progression, interchangeable alloy rockers and lower shock mount, ZS headset, BSA 73 threaded bottom bracket, ISCG 05, ABP, UDH hanger, Boost |
| Suspension | RockShox ZEB Ultimate fork, Linear XL spring with ButterCups, Charger 3.2 RC2 damper, 170 mm, 44 mm offset / RockShox Vivid Ultimate shock 205 x 65 mm, 160 mm |
| Drivetrain | Wireless SRAM X0 Eagle AXS T-Type 1x12: 30T steel chainring, XS-1295 10-52 cassette, X0 170 mm cranks, AXS battery with charger |
| Brakes | SRAM Maven Silver hydraulic 4-piston, HS2 200 mm and 180 mm rotors |
| Wheels / tyres | Bontrager Line Pro 30 / Maxxis Assegai MaxxGrip and Minion DHR II MaxxTerra 29x2.5, EXO+ casing, Tubeless Ready |
| Cockpit | Race Face ERA carbon handlebar 35 mm, 800 mm, 27.5 mm rise / Race Face Turbine R stem 40 mm, 0° |
| Saddle / seatpost | Trek Aeolus Pro carbon rails, 145 mm / wireless Fox Transfer NEO, 150 to 200 mm depending on size |
| Weight | Weight not published by Trek for this version (for reference: Fuel LX 9.8 XT Di2, same carbon frame, 15.97 kg in a size M) |
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At a glance
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For the mountain biker who wants a clean bike that is simple to maintain, with no rubbing housing or cable to re-tension, and an uncluttered cockpit. It is also aimed at riders who often transport their bike and want to avoid damaged housing when loading.
OCLV carbon, Trek's signature. The Fuel LX 9.9 shares the OCLV Mountain frame of the 9.8: the same carbon designed to withstand the repeated impacts of descending, the same Trek lifetime warranty. The difference therefore lies in the spec. A useful reminder: on the Gen 7 Fuel platform, Trek measures 3.31 kg for the carbon frameset and 4.95 kg for the aluminium one (Fuel EX, size M).
| OCLV Mountain (Fuel LX 9.9) | OCLV Mountain (Fuel LX 9.8) | Alpha NEXT Platinum (Fuel LX 9) | |
| Level | Top-end mountain bike carbon | The same carbon | Higher-grade MTB aluminium |
| Spec | RockShox Ultimate, X0 AXS, wireless dropper | Fox Factory, Shimano XT or XT Di2 | Fox Factory or RockShox depending on version |
| Published weight (M) | not disclosed | 15.97 kg (XT Di2) | 17.38 to 17.79 kg |
| What it means | The most adjustable, zero control cables | Same frame, simpler | Heavier, tough frame |
Put simply: the 9.9 does not give you a lighter frame than the 9.8, it gives you RockShox Ultimate suspension with more adjustments, a drivetrain and dropper post with no control cables at all, and Line Pro 30 wheels. Trek does not publish its weight: the closest reference remains the Fuel LX 9.8 XT Di2.
With no derailleur or dropper cable, only the brake hoses need routing: the cockpit is clean and removing the handlebar becomes simpler. The Fox Transfer NEO dropper receives its command wirelessly, eliminating the cable friction that eventually slows the return of a conventional dropper.
The flip side of wireless is batteries: the derailleur one, supplied with its charger, and the dropper one need regular recharging. A simple routine is enough, for example charging before every riding weekend, and we show you how to pair the controls and run updates at handover.
| Model | Frame | Travel rear / front | Drivetrain | Weight (M) |
| Fuel EX 9.9 X0 AXS | OCLV Mountain carbon | 145 / 150 mm | SRAM X0 Eagle AXS T-Type 1x12 | 14.08 kg |
| Fuel LX 9.8 XT Di2 | OCLV Mountain carbon | 160 / 170 mm | Shimano XT Di2 1x12 | 15.97 kg |
| Fuel LX 9.9 X0 AXS | OCLV Mountain carbon | 160 / 170 mm | SRAM X0 Eagle AXS T-Type 1x12 | not published |
| Slash 9.9 X0 AXS T-Type | OCLV Mountain carbon | 170 / 170 mm | SRAM X0 Eagle AXS T-Type 1x12 | 16.53 kg |
Our take: with the same carbon frame, the 9.9 stands apart from the 9.8 XT Di2 (15.97 kg in M) with its fully wireless set-up and RockShox Ultimate suspension. The Fuel EX 9.9 X0 AXS is lighter at 14.08 kg, but limited to 145/150 mm.
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LVR sizing advice Between two sizes: the smaller one if you want a lively bike on tight trails, the larger one if you favour composure at high speed. The Fox Transfer NEO dropper goes from 150 to 200 mm of travel depending on size.
Source: Trek size guide. Bike fitting available in our Béziers shop. |
| How many batteries? | One for the AXS derailleur, one for the Transfer NEO dropper: two batteries to charge. |
| Do I need an app? | It is used for settings and updates; we configure it with you. |
| Easier to transport? | Yes, there is no control housing at risk of being pinched when loading. |
| Is the glossy carmine fragile? | Adhesive protection on exposed areas preserves the gloss. |
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The LVR Cycles verdict The cleanest Fuel LX, with a wireless drivetrain and dropper that simplify everyday maintenance. Its glossy dark carmine on matte black gives it an elegant presence.
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Why buy from LVR Cycles? As a Trek dealer in Béziers, we pair your AXS and Transfer NEO components, update the firmware and teach you the charging routine.
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