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The most refined version of the range, the Trek Fuel MX 9.9 X0 AXS Gen 7 brings together an OCLV Mountain frame, a 170 mm ZEB Ultimate up front, a Vivid Ultimate handling 150 mm at the rear, the wireless SRAM X0 Eagle AXS groupset and Bontrager Line Pro 30 carbon rims. Weight not published by Trek for this version; Trek does, however, publish 14.08 kg in a size M for its trail cousin, the Fuel EX 9.9 X0 AXS. Miami Green/Aloha Marble paintwork: an intense teal veined with light green.
| Frame | OCLV Mountain carbon, integrated storage, adjustable progression, interchangeable rocker link and lower shock mount, down tube and transport protection, threaded BSA 73 bottom bracket, ISCG 05, ABP, UDH hanger, Boost |
| Suspension | RockShox ZEB Ultimate fork, Charger 3.2 RC2 damper, 170 mm / RockShox Vivid Ultimate shock 205 x 65 mm, 150 mm at the rear |
| Drivetrain | Wireless SRAM X0 Eagle AXS T-Type 1x12, 30T chainring, XS-1295 10-52 cassette, AXS battery with charger |
| Brakes | SRAM Maven Silver hydraulic 4-piston, HS2 200 and 180 mm rotors |
| Wheels / tyres | Bontrager Line Pro 30 carbon / mixed set-up: Maxxis Assegai 29x2.5 MaxxGrip up front, Minion DHR II 27.5x2.5 MaxxTerra at the rear, EXO+, Tubeless Ready |
| Cockpit | Race Face ERA carbon handlebar 800 mm (27.5 mm rise), Race Face Turbine R stem 40 mm |
| Saddle / seatpost | Trek Aeolus Pro carbon rails 145 mm / Fox Transfer Neo dropper post, 150 to 200 mm depending on size |
| Weight | Weight not published by Trek for this version; for reference: Fuel EX 9.9 X0 AXS 14.08 kg in a size M |
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At a glance
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For the experienced mountain biker who rides a lot, knows their set-up preferences and wants the best original equipment, without having to change wheels, cockpit or seatpost in the months after purchase.
OCLV Mountain carbon, Trek's signature. At the top of the Fuel MX range, the 9.9 X0 AXS keeps the OCLV Mountain carbon frame of the 9.8: a mountain bike carbon compacted under heat and pressure, with fibres laid out to withstand repeated impacts rather than break lightness records. What sets it apart is the kit fitted around it: carbon wheels, carbon handlebar and wireless electronics. Trek lifetime warranty on the frame.
| OCLV Mountain (Fuel MX 9.8 / 9.9) | Alpha NEXT Platinum (Fuel MX 9) | Carbon Fuel EX / LX | |
| Level | Trek's mountain bike carbon, tuned for impacts | Trek's most advanced aluminium | Same Gen 7 Fuel platform |
| Construction | Plies compacted under heat and pressure | Alpha NEXT Platinum alloy | Identical OCLV Mountain carbon |
| Gen 7 Fuel frameset (M) | 3.31 kg (Fuel EX figure) | 4.95 kg (Fuel EX figure) | 3.31 kg for the EX |
| What it means | Around 1.6 kg less on the frame, lifetime warranty | Heavier, gentler on the budget | 145 / 150 mm (EX) or 160 / 170 mm (LX) |
Put simply: on a 9.9, it is no longer the frame that makes the difference but the parts that complete it. The Line Pro 30 carbon wheels and the Race Face ERA cockpit reduce rotating mass and weight up front, which you feel above all when changing direction and accelerating.
The Line Pro 30 carbon wheels reduce rotating mass, which you feel at every acceleration out of corners and over successive bumps. The 800 mm Race Face ERA carbon handlebar dampens some of the scree vibrations before they reach your wrists, delaying forearm fatigue.
The Fox Transfer Neo dropper post is operated without a cable, like the SRAM X0 AXS derailleur: the cockpit keeps only the brake hoses and becomes very clean. We configure these electronic components and update their firmware at handover.
| Model | Frame | Travel rear / front | Drivetrain | Weight (M) |
| Fuel EX 9.9 X0 AXS | OCLV Mountain carbon | 145 / 150 mm | Wireless SRAM X0 AXS | 14.08 kg |
| Fuel MX 9.8 XT Di2 | OCLV Mountain carbon | 150 / 160 mm | Wireless Shimano XT Di2 | not disclosed |
| Fuel MX 9.9 X0 AXS | OCLV Mountain carbon | 150 / 170 mm | Wireless SRAM X0 AXS | not published |
| Fuel LX 9.8 XT Di2 | OCLV Mountain carbon | 160 / 170 mm | Wireless Shimano XT Di2 | 15.97 kg |
Our take: the Fuel EX 9.9 X0 AXS, claimed at 14.08 kg in M, makes do with 145/150 mm; this MX adds 5 mm at the rear and 20 mm up front. Compared with the MX 9.8 XT Di2, it brings the 170 mm fork and carbon wheels.
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LVR sizing advice Between two sizes, choose the smaller one for playful handling, the larger one for stability on long descents. The Fox Transfer Neo goes from 150 mm in S to 175 mm in M and 200 mm above.
Source: Trek size guide. Bike fitting available in our Béziers shop. |
| Are carbon wheels fragile? | They are designed for mountain biking; a properly inflated tubeless set-up limits the risks from impacts. |
| How is the seatpost operated? | Without a cable: the Fox Transfer Neo is electronic, like the X0 AXS derailleur. |
| Which batteries need charging? | The AXS derailleur one, supplied with its charger, and the dropper post one. |
| Is the marbling unique? | The light green veins vary slightly from one frame to another. |
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The LVR Cycles verdict The most refined Fuel MX, with carbon wheels and electronic drivetrain and dropper for a complete bike straight out of the workshop. Its teal veined with light green gives it a fresh, distinctive look.
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Why buy from LVR Cycles? As a Trek dealer in Béziers, we configure the X0 AXS groupset and Fox dropper, set the ZEB and Vivid for your weight and service your high-end Fuel MX.
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