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The Trek Fuel EX 9.8 Eagle 90 Gen 7 is an OCLV Mountain carbon trail mountain bike with an adjustable frame: adjustable suspension progression and an interchangeable lower shock mount. It runs 145 mm at the rear and 150 mm at the front with RockShox Ultimate suspension and a SRAM Eagle 90 drivetrain. Trek does not give its weight; the 9.8 XT, with the identical frame, weighs 15.28 kg in size M. Gloss Chameleon Green/Matte Black pairs a glossy green with shifting glints with matt black.
| Frame | OCLV Mountain carbon, integrated storage, adjustable progression, threaded BSA 73, ISCG 05, UDH hanger, Boost |
| Suspension | RockShox Lyrik Ultimate Charger 3.1 RC 150 mm / Super Deluxe Ultimate RC2T 145 mm |
| Drivetrain | Mechanical SRAM Eagle 90 T-Type 1x12, 30T steel chainring, XS-1275 10-52 cassette, GX Eagle chain |
| Brakes | SRAM Maven Bronze 4-piston hydraulic, HS2 200 mm (front) and 180 mm (rear) rotors |
| Wheels / tyres | Bontrager Line Comp 30 aluminium / Maxxis Minion DHF (front) and DHR II (rear) 2.5, EXO+, Tubeless Ready |
| Cockpit | Race Face Turbine alloy 35 mm handlebar, 40 mm rise, Bontrager Elite 45 mm stem |
| Saddle / seatpost | Verse Short Comp 145 mm / Bontrager Line Dropper post, 150 to 200 mm depending on size |
| Weight | Weight not published by Trek for this version; reference: Fuel EX 9.8 XT, identical carbon frame, 15.28 kg in size M |
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At a glance
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For the curious mountain biker who likes to adapt their bike to the terrain of the moment: more progressive suspension for jumps and the bike park, more linear for rough trails. It also suits riders who are progressing fast and want a bike that can keep up without being replaced.
OCLV carbon, Trek's signature. For mountain biking, Trek adapts its OCLV process into a Mountain version: the fibre sheets are still heat-compacted under pressure to eliminate micro-voids, but the layup prioritises resistance to rock strikes and crashes over saving grams. On the Gen 7 Fuel EX, the carbon frame kit weighs 3.31 kg in size M, versus 4.95 kg for the Alpha NEXT Platinum aluminium version, and it is covered by Trek's lifetime warranty.
| OCLV Mountain (Fuel EX 9.8 / 9.9) | Alpha NEXT Platinum (Fuel EX 5 to 9) | Road OCLV (Madone, Domane) | |
| Level | Trek's mountain bike carbon | Trek's best MTB aluminium | Road carbon, OCLV 500 to 900 |
| Construction | Layup focused on impact resistance | Hydroformed tubes, dressed welds | Layup focused on lightness and stiffness |
| Fuel EX frameset (M) | 3.31 kg | 4.95 kg | not applicable |
| What it means | 1.64 kg lighter than aluminium, same geometry | Heavier, gentler on the budget | Not designed for MTB impacts |
In short: the 9.8 Eagle 90 is the entry point to the carbon Fuel EX, and it makes a clear-cut choice: the budget goes into the frame and the RockShox Ultimate suspension, the same as on the 9.9, while the drivetrain stays mechanical and simple. Trek does not publish its weight; the 9.8 XT, with the same frame, serves as a reference at 15.28 kg in M.
Adjustable progression changes how the shock firms up at the end of its travel. More progressive, the bike resists bottoming out better on landings; more linear, it uses more of its travel over the strings of small stones in the garrigue. This adjustment is done in the workshop, and we always combine it with a sag check.
The ISCG 05 mounts and UDH hanger leave the door open to upgrades: a chain guide for the bike park, a wireless derailleur later. The threaded BSA bottom bracket, which does not creak and comes out without special tools, also simplifies maintenance season after season.
| Model | Frame | Travel rear / front | Drivetrain | Weight (M) |
| Fuel EX 9 Eagle 90 | Alpha NEXT Platinum alloy | 145 / 150 mm | SRAM Eagle 90 T-Type | 16.58 kg |
| Fuel EX 9.8 Eagle 90 | OCLV Mountain carbon | 145 / 150 mm | SRAM Eagle 90 T-Type | not published |
| Fuel EX 9.8 XT | OCLV Mountain carbon | 145 / 150 mm | Mechanical Shimano XT | 15.28 kg |
| Fuel EX 9.9 X0 AXS | OCLV Mountain carbon | 145 / 150 mm | Wireless SRAM X0 Eagle AXS | 14.08 kg |
Our take: the four colourways of the 9.8 Eagle 90 share the same adjustable frame as the 9.9 X0 AXS. The aluminium Fuel EX 9 Eagle 90 offers the same drivetrain for 16.58 kg in M, with a heavier frame.
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LVR sizing advice If you are between two sizes, the smaller makes the Fuel EX more playful in tight switchbacks, the larger more stable at high speed in rock gardens. The dropper post goes from 150 to 200 mm of travel depending on size, and size S runs a mixed 29 / 27.5 set-up.
Source: Trek size guide. Bike fitting available in our Béziers shop. |
| What does adjustable progression change? | Firmness at the end of the travel: more progressive for jumping, more linear for rough terrain. |
| Is a special tool needed? | A torque wrench and a little method; we do it in the workshop along with a sag adjustment. |
| Does the green change colour? | Yes, depending on the angle and light, the chameleon green takes on golden or bluish glints. |
| Suitable for the bike park? | For recreational riding, yes, with a chain guide fitted to the ISCG 05 mounts. |
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The LVR Cycles verdict A carbon Fuel EX that adapts to its rider thanks to its adjustable frame and mounts ready for upgrades. Its glossy chameleon green over matt black does not go unnoticed.
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Why buy from LVR Cycles? In Béziers, we adjust the progression of your Fuel EX to your riding, set sag and rebound and explain each setting when we hand the bike over.
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
Carbon full-suspension mountain bike Trek Fuel EX 9.8 Eagle 90 chameleon green: adjustable, 145/150 mm
