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Aluminium full-suspension mountain bike Trek Top Fuel 8 SLX/XT matte dark web 12-speed

Aluminium full-suspension mountain bike Trek Top Fuel 8 SLX/XT matte black: 120/130 mm, Fox, 14.58 kg

$4,102.34 Incl. Tax

~~$4,459.17~~ MSRP

Recommended supplier selling price in 2026

Color

Black

Size

S
M / l
L

Size charts

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Trek Top Fuel 8 Matte Dark Web: the versatile lightweight trail bike

The Gen 4 Trek Top Fuel 8 is an Alpha Platinum aluminium full-suspension mountain bike, with 120 mm of rear travel, a 130 mm Fox Rhythm 34 fork and a Shimano 1x12 drivetrain with XT rear derailleur, weighing 14.58 kg in size M. Four-piston brakes, a dropper post and internal storage make it a complete bike straight out of the workshop. Its Matte Dark Web finish, a very understated matt black, shows off the lines of the frame.

Technical specifications

Frame	Alpha Platinum aluminium, internal storage, 4-position Mino Link, ABP, down tube protection, Boost148, 120-130 mm
Suspension	Fox Rhythm 34 Float EVOL GRIP, 130 mm / Fox Performance Float DPS 3-position 185x50 mm, 120 mm
Drivetrain	Shimano 1x12: XT M8100 rear derailleur, SLX 10-51 cassette, Deore 30T chainset
Brakes	Shimano 4-piston, M6100 lever, M6120 calliper, RT66 180 mm rotors
Wheels / tyres	Bontrager Line Comp 30 / Gunnison Pro XR 2.40 Tubeless Ready (27.5 in S, 29 above)
Cockpit	Bontrager Line alloy 780 mm handlebar, Elite 45 mm stem
Saddle / seatpost	Bontrager Verse P3 / Line Dropper 100 mm (S) or 170 mm
Weight	14.58 kg in size M (Trek figure, with tubeless sealant)

At a glance

✓ Alpha Platinum aluminium	✓ 120 mm rear / 130 mm front
✓ Shimano XT rear derailleur	✓ 4-piston brakes
✓ 3-position Fox shock	✓ 14.58 kg in size M

Who is it for?

For the all-round mountain biker who wants one bike to do it all: Sunday loops, long rides with plenty of climbing and moderately technical descents. It is also a very good choice for anyone taking part in regional marathon events without chasing the clock at all costs.

The LVR workshop view

Alpha Platinum aluminium, at the heart of the Top Fuel 8. The Gen 4 Top Fuel comes in carbon and aluminium on the same design. This Top Fuel 8 uses Alpha Platinum, Trek's high-end aluminium, with internal storage, a four-position Mino Link and the ABP pivot that keeps the suspension active under braking.

	Alpha Platinum (this bike)	OCLV Mountain (Top Fuel 9.x)	Alpha Silver (Marlin)
Level	Trek's high-end aluminium	Trek's mountain bike carbon	Entry-level aluminium
Construction	Hydroformed tubes, smoothed welds	OCLV layup reinforced against impacts	Simpler tubes, hardtails
Reference bike	Top Fuel 8: 14.58 kg (M)	Top Fuel 9.8 XT Di2: 14.00 kg (M)	Marlin (hardtail)
What it means	The right balance of strength and weight	Less weight, frame with lifetime warranty	No rear suspension

Put simply: only 580 g separate this Top Fuel 8 from the carbon 9.8 XT Di2. For a rider who mainly rides for fun, it is the easiest gap to accept in the range.

The three-position Fox Float DPS shock is a real asset on this type of bike: open for descents, middle for flowing trails, firm for long fire-road climbs. Combined with the ABP pivot, which keeps the suspension active under braking, it makes the Top Fuel 8 very stable on rough garrigue descents.

Four-piston Shimano brakes are rare at this level of the range; they make all the difference on the long descents of the Caroux, where lighter brakes heat up quickly. The four-position Mino Link lets you adjust the geometry, and we make that change in the workshop if you wish.

Which Top Fuel should you choose?

Model	Frame	Travel rear / front	Drivetrain	Weight (M)
Top Fuel 5 (Gen 3)	Alpha Platinum alloy	120 / 130 mm	Shimano Deore 1x12	15.60 kg
Top Fuel 8	Alpha Platinum alloy	120 / 130 mm	Shimano SLX/XT 1x12	14.58 kg
Top Fuel 8 Eagle 70	Alpha Platinum alloy	130 / 140 mm	SRAM Eagle 70 T-Type 1x12	14.88 kg
Top Fuel 9.8 XT Di2	OCLV Mountain carbon	120 / 130 mm	Shimano XT Di2 1x12	14.00 kg

Our take: at 14.58 kg, it is only 580 g heavier than the carbon Top Fuel 9.8 XT Di2. The Eagle 70 version of the Top Fuel 8 gains 10 mm at the front (140 mm) for 300 g more.

LVR sizing advice

The S gets 27.5-inch wheels and a 100 mm post, better suited to smaller riders; the other sizes move to 29-inch wheels and 170 mm. Between two sizes, come and compare the position in the shop.

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

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

Your questions

Light enough for marathon events?	Yes, 14.58 kg in M for an alloy full-suspension bike is a very respectable weight for sporty trail rides.
Three shock positions?	Open, middle and firm: you adapt the bike to the terrain with a simple lever.
Which wheel size in size S?	The S runs 27.5-inch wheels, the other sizes 29; it is Trek's choice for smaller riders.
Is matt black fragile?	Matte Dark Web cleans with mild soap; avoid polishing products.

The LVR Cycles verdict

The most versatile Top Fuel in the aluminium range, with brakes and a shock above its station. Its Matte Dark Web black keeps a low profile.

Pros
+ Shimano 4-piston brakes
+ 3-position Fox shock
+ Low weight for an alloy frame

Cons
- Drivetrain mixing SLX and XT
- Rhythm fork less refined than a Factory

Why buy from LVR Cycles? In Béziers, we prepare your Top Fuel 8, set the sag and rebound to your weight and look after Fox suspension servicing and brake bleeding.

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-5319326

Data sheet