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Carbon full-suspension mountain bike Trek Fuel LX 9.8 XT Di2 miami green/aloha marble 12-speed

Carbon full-suspension mountain bike Trek Fuel LX 9.8 XT Di2 Miami green: wireless XT Di2, 15.97 kg in M

£6,009.88 Incl. Tax

Color

Green

Size

Size charts

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Trek Fuel LX 9.8 XT Di2 Miami Green: shifting under full load

The Trek Fuel LX 9.8 XT Di2 Gen 7 combines an OCLV Mountain carbon frame with the electronic Shimano XT Di2 1x12 drivetrain, a 170 mm Fox Factory 38 fork and a Fox DHX2 coil for 160 mm at the rear. On the scales, Trek claims 15.97 kg in a size M with tubeless sealant. The Miami Green/Aloha Marble colourway pairs an aqua green close to teal with a soft green marbling.

Technical specifications

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	Fox Factory 38 Float EVOL fork, GRIP X2 cartridge, 170 mm, 44 mm offset / Fox DHX2 coil shock 205 x 65 mm, 160 mm
Drivetrain	Shimano XT Di2 M8250 1x12 with wireless shifter: 30T chainring, XT 10-51 cassette, XT M8200 170 mm cranks (165 mm depending on size)
Brakes	Shimano XT M8220 4-piston hydraulic, RT86 203 mm and 180 mm rotors
Wheels / tyres	Bontrager Line Comp 30 / Maxxis Assegai MaxxGrip and Minion DHR II MaxxTerra 29x2.5, EXO+ casing, Tubeless Ready
Cockpit	Race Face Turbine alloy handlebar 35 mm, 40 mm rise / Bontrager Elite stem 45 mm, 0°
Saddle / seatpost	Verse Short Comp steel rails, 145 mm / Bontrager Line Dropper 150 to 200 mm depending on size
Weight	15.97 kg in size M (Trek figure, with tubeless sealant)

At a glance

✓ OCLV Mountain carbon frame	✓ 160 mm rear / 170 mm front
✓ Programmable Shimano XT Di2 1x12	✓ Fox DHX2 coil and Fox 38 fork
✓ Integrated frame storage	✓ 15.97 kg in size M

Who is it for?

For the mountain biker who loves technical climbs as much as descents, and wants to shift at the right moment even when pushing hard on the pedals. It suits riders looking for a light enduro bike to pedal back up their descents several times per ride.

The LVR workshop view

OCLV carbon, Trek's signature. For its mountain bikes, Trek adapts its OCLV process into a Mountain version: the fibres are oriented and reinforced where an enduro frame takes the hits, under the down tube and around the pivots. The result is a frame that is lighter than aluminium without being more fragile, covered by Trek's lifetime warranty. On the Gen 7 Fuel platform, the frame kit difference reaches 1.64 kg in size M according to Trek (3.31 kg versus 4.95 kg, measured on the Fuel EX).

	OCLV Mountain (Fuel LX 9.8 / 9.9)	Alpha NEXT Platinum (Fuel LX 9)	Alpha Silver (Marlin)
Level	Trek's most advanced mountain bike carbon	Higher-grade MTB aluminium	Entry-level aluminium
Construction	OCLV layers reinforced in impact zones	Hydroforming, neat welds	Standard tubes
Complete Fuel LX (M)	15.97 kg (9.8 XT Di2)	17.79 kg (9 XT)	not applicable
What it means	1.82 kg less to haul uphill	Heavier, more affordable	Hardtail range

In short: 15.97 kg in size M for a 160 / 170 mm coil-sprung bike is the lowest published weight in the whole Fuel LX family. Compared with the aluminium Fuel LX 9 XT, the 1.82 kg difference comes from the carbon frame but also from the Di2 drivetrain, which is lighter than the cable version.

On a rocky ramp, a missed shift costs you your balance. The XT Di2 M8250 derailleur is motorised: it shifts up or down a sprocket with the same precision whatever the chain tension, and the wireless shifter responds to a simple press of the thumb, with no lever effort.

With no derailleur cable, there is no more housing filling up with garrigue dust and no adjustment to redo after a few weeks. The 10-51 cassette and 30-tooth chainring stay the same as on the mechanical version: the gain is in precision, not gearing.

Which Fuel should you choose?

Model	Frame	Travel rear / front	Drivetrain	Weight (M)
Fuel MX 9 XT	Alpha NEXT Platinum alloy	150 / 160 mm	Mechanical Shimano XT 1x12	16.91 kg
Fuel LX 9 XT	Alpha NEXT Platinum alloy	160 / 170 mm	Mechanical Shimano XT 1x12	17.79 kg
Fuel LX 9.8 XT Di2	OCLV Mountain carbon	160 / 170 mm	Shimano XT Di2 1x12	15.97 kg
Slash 9.8 XT Di2	OCLV Mountain carbon	170 / 170 mm	Shimano XT Di2 1x12	16.63 kg

Our take: at 15.97 kg in M, this 9.8 XT Di2 is 940 g lighter than the alloy Fuel MX 9 XT, which only offers 150/160 mm. The Slash 9.8 XT Di2 weighs 16.63 kg and gains 10 mm at the rear.

LVR sizing advice

The Fuel LX is chosen first according to the rider's height: between two sizes, the smaller one makes the bike more playful in hairpins, the larger one more stable at high speed. Dropper post travel increases with size.

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

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

Your questions

Shifting while pushing hard?	Yes, that is the strength of Di2: the motorised derailleur shifts without hesitation under load.
What happens when the battery is flat?	The drivetrain stays on the current sprocket; regular charging avoids surprises.
Can the buttons be programmed?	Yes, via the Shimano app: we set it up with you in our workshop.
Does the Miami green show the dirt?	Its light shade shows dust but cleans very easily with water.

The LVR Cycles verdict

A light, precise carbon Fuel LX, ideal for those who attack technical climbs as hard as the descents. Its aqua green marbled with soft green freshens up the look of an enduro bike.

Pros
+ Precise shifting under load
+ 15.97 kg in a size M
+ Light, original colour

Cons
- Battery to keep an eye on
- Stock alloy handlebar

Why buy from LVR Cycles? In Béziers, we program your Di2 drivetrain, update its firmware and set up the suspension of your Fuel LX for your favourite terrain.

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-5349064

Data sheet