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Carbon full-suspension mountain bike Trek Fuel EX 9.8 XT Di2 gloss dark carmine/matte trek black 12-speed

Carbon full-suspension mountain bike Trek Fuel EX 9.8 XT Di2 carmine red: Di2 under load, 145/150 mm

CHF6,403.25 Incl. Tax

Color

Black and red

Size

Size charts

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Trek Fuel EX 9.8 XT Di2 Dark Carmine: shifting mid-climb

Equipped with the wireless Shimano XT Di2 M8250, an OCLV Mountain carbon frame and Fox Factory 36 and Float X suspension, the Trek Fuel EX 9.8 XT Di2 Gen 7 is aimed at the rider who is constantly accelerating. Trek has not published its weight for this version; the 9.8 XT with the identical frame weighs 15.28 kg in size M. The Gloss Dark Carmine/Matte Trek Black colour contrasts a glossy dark carmine red with matt black.

Technical specifications

Frame	OCLV Mountain carbon, integrated storage, adjustable progression, threaded BSA 73, ISCG 05, UDH hanger, Boost
Suspension	Fox Factory 36 GRIP X2 150 mm / Fox Factory Float X 145 mm
Drivetrain	Wireless Shimano XT Di2 1x12, long-cage M8250 derailleur, XT M8200 30T chainset, XT M8200 10-51 cassette
Brakes	Shimano XT M8220 4-piston hydraulic, RT86 203 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, 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

At a glance

✓ OCLV Mountain frame with hatch	✓ Wireless Shimano XT Di2 M8250
✓ Fox Factory, 145 / 150 mm	✓ 10-51 cassette, 12 speeds
✓ 4-piston XT M8220 brakes	✓ Weight not published (reference 15.28 kg)

Who is it for?

For the sporty mountain biker who attacks technical climbs, changes gear often and wants a drivetrain that responds instantly, even under load. It will also appeal to riders who take part in regional organised MTB rides and want a bike that is as efficient uphill as it is downhill.

The LVR workshop view

OCLV carbon, Trek's signature. OCLV refers to the moulding method Trek has applied to its fibres for more than thirty years: compaction under pressure and at high temperature that eliminates internal voids. Its Mountain version is designed for off-road riding, with a layup that prioritises strength against impacts. Combined with the Gen 7 Fuel EX, this carbon brings the frame kit down to 3.31 kg in M, 1.64 kg less than the aluminium version, with 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	The carbon Trek reserves for mountain biking	The pinnacle of Alpha aluminium	Road range, from OCLV 500 to 900
Construction	OCLV, impact resistance first	Tubes formed under fluid pressure	OCLV, weight-to-stiffness ratio first
Fuel EX frameset (M)	3.31 kg	4.95 kg	not relevant for MTB
What it means	Lighter bike, lifetime warranty	Heavier but durable frame	Material designed for tarmac

In short: the 9.8 XT Di2 shares its frame, suspension, brakes and wheels with the 9.8 XT; only the derailleur changes, to wireless and electronic. Trek does not publish a weight for this version, so the 9.8 XT at 15.28 kg in M remains the most accurate reference.

Shifting from one sprocket to another mid-slope is when a drivetrain shows its limits: with Di2, the shifter takes no thumb effort, and the derailleur executes the change with the same precision every time. On the rocky ramps of the Caroux, you can keep both hands firmly on the bar.

The Fox Float X shock, with its separate reservoir and platform lever, helps maintain decent efficiency on long climbs without locking out the suspension. Combined with the 30x51, it lets you climb seated on steep sections, with the rear wheel glued to the ground.

Which Fuel should you choose?

Model	Frame	Travel rear / front	Drivetrain	Weight (M)
Fuel EX 9 XT Di2	Alpha NEXT Platinum alloy	145 / 150 mm	Wireless Shimano XT Di2	16.88 kg
Fuel EX 9.8 XT	OCLV Mountain carbon	145 / 150 mm	Mechanical Shimano XT	15.28 kg
Fuel EX 9.8 XT Di2	OCLV Mountain carbon	145 / 150 mm	Wireless Shimano XT Di2	not published
Fuel EX 9.9 X0 AXS	OCLV Mountain carbon	145 / 150 mm	Wireless SRAM X0 Eagle AXS	14.08 kg

Our take: for the sporty rider, the 9.8 XT Di2 brings wireless consistency to the same frame as the 9.8 XT. The 9.9 X0 AXS adds carbon wheels and RockShox suspension for 14.08 kg in M.

LVR sizing advice

If you are between two sizes, the smaller one suits you if you like to place the bike and jump, the larger one if you mainly ride fast and long. Dropper post travel follows size, and the S gets a 27.5-inch rear wheel.

Size	S	M	L	XL	XXL
Rider height (cm)	155-165	165-177	177-188	188-195	195-203
Inseam (cm)	74-78	79-83	84-89	89-91	91-97
Dropper post (mm)	150	170	200	200	200
Wheels front / rear (in)	29 / 27.5	29 / 29	29 / 29	29 / 29	29 / 29

Source: Trek size guide. Bike fitting available in our Béziers shop.

Your questions

Shifting under load?	Yes, Di2 allows it, but easing off the pressure a little is still better for longevity.
What is the lowest gear?	30 x 51 teeth, enough to climb seated on steep slopes.
Useful on organised MTB rides?	Yes, the consistent drivetrain and storage hatch are invaluable over long distances.
Is the carmine red delicate?	The gloss paint can be protected with a film applied in the workshop to exposed areas.

The LVR Cycles verdict

A carbon Fuel EX for the sporty rider who wants a flawless drivetrain in every situation. The glossy carmine red over matt black gives it a bold look.

Pros
+ Instant shifts under load
+ Fox Float X with platform
+ Sporty red and black contrast

Cons
- Battery to keep an eye on
- Weight not published by Trek

Why buy from LVR Cycles? In Béziers, we set up your Di2 drivetrain, adjust the Float X platform and prepare your Fuel EX for regional organised MTB rides.

Please note that the specifications may be changed without prior notice by the manufacturer, based on the availability of components and other factors.

Reference TRK-5348962

Data sheet