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Carbon full-suspension mountain bike Trek Top Fuel 9.8 XT Di2 dark star 12-speed

Carbon full-suspension mountain bike Trek Top Fuel 9.8 XT Di2 black: 120/130 mm, XT Di2, Pike, 14.00 kg in M

CHF5,351.14 Incl. Tax

~~CHF6,403.25~~ MSRP

-16%

Recommended supplier selling price in 2026

Color

Black

Size

S
M
M / l
L
XL

Size charts

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Trek Top Fuel 9.8 XT Di2 Dark Star: electronic carbon downcountry

The Gen 4 Trek Top Fuel 9.8 XT Di2 is an OCLV Mountain carbon full-suspension mountain bike, with 120 mm at the rear, a 130 mm RockShox Pike fork and the Shimano XT Di2 12-speed electronic drivetrain, weighing 14.00 kg in size M. A carbon handlebar, Deluxe Ultimate shock and a dropper post of up to 200 mm complete a very coherent package. The Dark Star colour, a deep black, plays on understated elegance.

Technical specifications

Frame	OCLV Mountain carbon, internal storage, 4-position Mino Link, ABP, down tube protection, Boost148, 120-130 mm
Suspension	RockShox Pike Select+ Charger 3.1 RC2, 130 mm / RockShox Deluxe Ultimate RCT 185x50 mm
Drivetrain	Shimano XT Di2 M8250 1x12, XT M8200 10-51 cassette, XT 30T chainset
Brakes	Shimano XT M8220 4-piston, RT86 180 mm rotors
Wheels / tyres	Bontrager Line Comp 30 / Gunnison RSL XT front, Montrose RSL XT rear 2.40 (27.5 in S)
Cockpit	Bontrager Line Pro carbon 780 mm handlebar, Line Pro 35 mm stem
Saddle / seatpost	Verse Short Comp / Line Dropper from 100 to 200 mm depending on size
Weight	14.00 kg in size M (Trek figure, with tubeless sealant)

At a glance

✓ OCLV Mountain carbon	✓ 120 mm rear / 130 mm front
✓ Shimano XT Di2	✓ RockShox Pike fork
✓ Line Pro carbon handlebar	✓ 14.00 kg in size M

Who is it for?

For the sporty mountain biker who loves long, fast rides with plenty of climbing and wants a bike that descends well, without the weight of a longer-travel trail bike. It is also aimed at riders racing regional XC marathons and long-distance events who want more comfort than a pure cross-country bike.

The LVR workshop view

OCLV Mountain carbon, the happy medium. The Top Fuel 9.8 is the first carbon model of the 4th generation. The OCLV Mountain layup is designed to withstand mountain bike impacts, and the frame keeps everything that makes a Top Fuel: internal storage, four-position Mino Link and ABP pivot. Trek's lifetime warranty covers the frame.

	OCLV Mountain (Top Fuel 9.x)	Alpha Platinum (Top Fuel 8)	Alpha Platinum (Top Fuel 5, Gen 3)
Level	Trek's mountain bike carbon	High-end aluminium	Same alloy, previous generation
Construction	OCLV layup tuned to absorb impacts	Hydroformed tubes, smoothed welds	Gen 3 frame, Knock Block 2.0
Reference bike	Top Fuel 9.8 XT Di2: 14.00 kg (M)	Top Fuel 8: 14.58 kg (M)	Top Fuel 5: 15.60 kg (M)
What it means	Sharper acceleration, lifetime frame warranty	Tough, less worrying in a crash	Entry into lightweight full-suspension trail riding

Put simply: a round 14 kg in size M, for a build that does not cut corners on reliability. Moving to carbon plus Di2 saves you 580 g over the aluminium Top Fuel 8.

Shimano XT Di2 changes the way you shift: gears engage precisely even under load, with no cable adjustments to redo. In the workshop, we update the firmware and configure the controls to suit your habits, which takes a few minutes at handover.

The RockShox Pike Select+ with Charger 3.1 RC2 damper offers separate compression and rebound adjustment; it stays precise and stiff on the rock slabs of the Caroux. At the rear, the Deluxe Ultimate RCT has an effective lockout for long fire-road climbs.

Which Top Fuel should you choose?

Model	Frame	Travel rear / front	Drivetrain	Weight (M)
Top Fuel 8	Alpha Platinum alloy	120 / 130 mm	Shimano SLX/XT 1x12	14.58 kg
Top Fuel 9.8 XT Di2	OCLV Mountain carbon	120 / 130 mm	Shimano XT Di2 1x12	14.00 kg
Top Fuel 9.9 XTR Di2	OCLV Mountain carbon	120 / 130 mm	Shimano XTR Di2 1x12	13.10 kg
Top Fuel 9.9 XX AXS	OCLV Mountain carbon	120 / 130 mm	SRAM XX AXS T-Type 1x12	12.85 kg

Our take: 580 g less than the aluminium Top Fuel 8, plus Shimano electronics. To get down to 13.10 kg, the 9.9 XTR Di2 keeps the same frame with lighter components.

LVR sizing advice

From S to XL: the S rolls on 27.5-inch wheels, the other sizes on 29. The dropper post grows with the frame, from 100 mm in S up to 200 mm in L and XL; a real bonus for tall riders.

Size	S	M	ML	L	XL
Rider height (cm)	155-165	165-177	173-180	177-188	188-195
Inseam (cm)	74-78	79-83	81-86	84-89	89-91
Wheels (inches)	27.5	29	29	29	29
Dropper post (mm)	100	170	170	200	200

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

Your questions

What is downcountry?	A light mountain bike for pedalling far, with enough travel to enjoy the descents.
Does the Di2 need charging?	Yes, like any electronic drivetrain; we show you how to charge it at handover.
Can it race XC?	Yes for long-distance events and marathons; for pure cross-country, the Supercaliber is better suited.
Is Dark Star black glossy?	It is a deep black, easy to look after with a gentle cleaner.

The LVR Cycles verdict

The most balanced carbon Top Fuel: light, electronic and reassuring on descents. Its Dark Star black gives it an understated, premium look.

Pros
+ Precise Shimano XT Di2
+ 14.00 kg in size M
+ Five sizes from S to XL

Cons
- Alloy Line Comp wheels
- Battery to charge

Why buy from LVR Cycles? As a Trek retailer in Béziers, we configure your Di2, set the RockShox suspension to your weight and look after its servicing.

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-5333140

Data sheet