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Carbon full-suspension mountain bike Trek Top Fuel 9.9 XX AXS lunar silver 12-speed

Carbon full-suspension mountain bike Trek Top Fuel 9.9 XX AXS silver: XX AXS T-Type, Reverb AXS, 12.85 kg in M

£6,034.92 Incl. Tax

~~£9,599.61~~ MSRP

-37%

Recommended supplier selling price in 2026

Color

Grey

Size

Size charts

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Trek Top Fuel 9.9 XX AXS Lunar Silver: the lightest Top Fuel

The Gen 4 Trek Top Fuel 9.9 XX AXS T-Type is the lightest Top Fuel in our selection: 12.85 kg in size M for a 120 / 130 mm OCLV Mountain carbon full-suspension bike. It combines the SRAM XX SL Eagle AXS T-Type wireless drivetrain, a Reverb AXS post, Level Ultimate brakes and a one-piece RSL bar-stem. Its Lunar Silver finish, a luminous lunar silver, highlights the shapes of the carbon frame.

Technical specifications

Frame	OCLV Mountain carbon, internal storage, 4-position Mino Link, ABP, down tube protection, Boost148, 120-130 mm
Suspension	RockShox Pike Ultimate Charger 3.1 RC2, 130 mm / RockShox Deluxe Ultimate RCT 185x50 mm
Drivetrain	Wireless SRAM XX SL Eagle AXS T-Type 1x12, XS-1299 10-52 cassette, XX 30T chainset
Brakes	SRAM Level Ultimate 4-piston, HS2 180 mm rotors
Wheels / tyres	Bontrager Line Pro 30 / Gunnison RSL XT 27.5x2.40 Tubeless Ready (size S)
Cockpit	Bontrager RSL one-piece OCLV carbon bar-stem, 820 mm, 35 mm stem
Saddle / seatpost	Verse Short Pro carbon rails / wireless RockShox Reverb AXS 100 mm (size S)
Weight	12.85 kg in size M (Trek figure, with tubeless sealant)

At a glance

✓ OCLV Mountain carbon	✓ SRAM XX SL AXS T-Type
✓ Wireless Reverb AXS	✓ One-piece RSL cockpit
✓ Level Ultimate brakes	✓ 12.85 kg in size M

Who is it for?

For the smaller mountain biker chasing pure performance in marathons or long-distance events, or who simply wants the lightest, best-equipped Top Fuel. It suits the rider who climbs a lot and wants to keep real descending capability.

The LVR workshop view

OCLV Mountain carbon, the featherweight version. The Top Fuel 9.9 XX AXS takes the Gen 4 carbon frame to its highest spec. The mountain bike OCLV layup reinforces exposed areas without adding weight, and the frame keeps its internal storage, Mino Link and ABP pivot. Combined with the one-piece RSL bar-stem and the XX groupset, it is the lightest build in our Top Fuel selection, with Trek's lifetime warranty.

	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 9.9 XX AXS: 12.85 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: 12.85 kg for a 120 / 130 mm trail bike is 1.73 kg less than the aluminium Top Fuel 8. Carbon explains only part of it; the wheels, drivetrain and cockpit do the rest.

The SRAM AXS ecosystem does away with all drivetrain and dropper cables: the cockpit is clean and the settings stay stable ride after ride. The XX SL T-Type rear derailleur, mounted on the UDH hanger, is both light and very resistant to impacts.

The four-piston SRAM Level Ultimate brakes favour low weight while keeping enough power for fast trail riding. On the very long descents of the Montagne Noire, we recommend checking the pads regularly; we handle bleeding in the workshop.

Which Top Fuel should you choose?

Model	Frame	Travel rear / front	Drivetrain	Weight (M)
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
Fuel EX 9.9 XTR (Gen 6)	OCLV Mountain carbon	140 / 150 mm	Shimano XTR 1x12	13.98 kg

Our take: 250 g less than the 9.9 XTR Di2 and 1.15 kg less than the 9.8 XT Di2. Compared with the Fuel EX 9.9 XTR, it saves 1.13 kg but gives up 20 mm of travel at each end.

LVR sizing advice

Available here in S, from 155 to 165 cm, with 27.5-inch wheels and a 100 mm Reverb AXS. We adjust the saddle height and cut down the 820 mm handlebar if needed.

Size	S
Rider height (cm)	155-165
Inseam (cm)	74-78
Wheels (inches)	27.5
Dropper post (mm)	100

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

Your questions

Is it the lightest?	Yes, among our Top Fuel models: 12.85 kg in size M according to Trek.
An 820 mm handlebar in S?	It can be cut down to suit your shoulders; we do it in the workshop.
AXS batteries?	The derailleur and post each have their own battery, charged with the supplied charger.
What is Lunar Silver like?	A bright, glossy silver that cleans easily with a gentle product.

The LVR Cycles verdict

The ultimate Top Fuel for riders who want low weight and a fully wireless set-up. Its Lunar Silver gives it a look that is both technical and elegant.

Pros
+ 12.85 kg in size M
+ SRAM XX SL AXS T-Type
+ One-piece RSL carbon cockpit

Cons
- Only available here in size S
- Level brakes lighter than they are powerful

Why buy from LVR Cycles? In Béziers, we pair your AXS drivetrain, cut the handlebar down if needed and set the RockShox suspension to your weight before your first ride.

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-5319423

Data sheet