The Trek Fuel EX 8 XT is an evolved trail bike, dialled for riders who chase down rowdy descents and want a bike that's happy to pedal back to the top and do it again. The lightweight alloy frame pairs with upgraded 12-speed Shimano XT drivetrain to keep shifting precise while a 150 mm FOX Rhythm fork with Float EVOL air spring cushions the blow from rocks and roots. In-frame storage and adjustable geometry give you all the perks that the come with the carbon model, but without the lofty price tag.

The Fuel EX Gen 6 gives you 140/150 mm of travel with extra adjustability features and more stable handling, plus a more robust frame with internal storage
You'll get upgraded components where it matters most, with 12-speed XT shifting and a rock-gobbling FOX Rhythm 36 fork
With the adjustable angle headset (angled cups sold separately) and Mino Link, you can choose from six different geometry configurations
The dropper post lets you lower your saddle on the fly so it's out of the way on descents
We expanded our size range to ensure a better fit for all riders, and use the best-fitting wheels for each frame size: XS frames get 27.5˝ wheels, S frames get to choose between 27.5˝ or 29˝, and sizes M and up get 29˝ wheels

Sunset Cycles offers the 2025 Trek Fuel EX 8 XT Gen 6 trail bike in Satin Mercury finish with up to 36 months 0% finance and free delivery.

The 2025 Trek FUEL EX (ALLOY) range: Fuel EX 8 XT Gen 6 (Mercury) | Fuel EX 8 XT Gen 6 (Navy) | Fuel EX 8 GX AXS T-Type Gen 6 (Keswick) | Fuel EX 8 GX AXS T-Type Gen 6 (Red)

Full Specification: Trek Fuel EX 8 XT Gen 6 (Mercury) 2025 Trail Bike

Frame & Fork
Frame	Alpha Platinum Aluminium, internal storage, angle-adjust headset, Mino Link adjustable geometry, adjustable leverage rate, guided internal routing, magnesium rocker link, 34.9 mm seat tube, ISCG 05, 55 mm chain line, BSA 73, downtube guard, shuttle guard, ABP, UDH, Boost148, 140 mm travel
Fork	Size: XS , S Fox Rhythm 36, Float EVOL air spring, GRIP damper, tapered steerer, 44 mm offset, Boost110, 15 mm Kabolt axle, 140 mm travel Size: M , ML , L , XL , XXL Fox Rhythm 36, Float EVOL air spring, GRIP damper, tapered steerer, 44 mm offset, Boost110, 15 mm Kabolt axle, 150 mm travel
Shock	Fox Performance Float X, 2-position damper, 185 mm x 55 mm
Wheels & Tyres
Wheel front	Size: XS , S Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle, 27.5" Size: M , ML , L , XL , XXL Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle, 29"
Wheel rear	Size: XS , S Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Boost148, 12 mm thru axle, 27.5" Size: M , ML , L , XL , XXL Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Boost148, 12 mm thru axle, 29"
Tyre	Size: XS , S Bontrager XR5 Team Issue, Tubeless Ready, Inner Strength casing, aramid bead, 60 tpi, 27.5x2.50" Size: M , ML , L , XL , XXL Bontrager XR5 Team Issue, Tubeless Ready, Inner Strength casing, aramid bead, 60 tpi, 29x2.50"
Drivetrain
Shifter	Shimano XT M8100, 12-speed
Rear derailleur	Shimano XT M8100, long cage
Crank	Shimano Deore M6120, 30T ring, 55 mm chainline, 170 mm length
Bottom bracket	Shimano BB-MT501 BSA
Cassette	Shimano XT M8100, 10-51, 12-speed
Chain	Shimano SLX M7100, 12-speed
Components
Saddle	Size: XS , S , M , ML , L , XL , XXL Bontrager Verse P3, chromoly rails Size: XS , S , M , ML , L , XL , XXL Bontrager Arvada, hollow chromoly rails, 138 mm width
Seatpost	Size: XS , S TranzX JD-YSP39, 100 mm travel, internal routing, 34.9 mm Size: XS , S Bontrager Line Dropper, 100mm travel, MaxFlow, internal routing, 34.9 mm, 310mm length Size: M , ML TranzX JD-YSP39, 150 mm travel, internal routing, 34.9 mm Size: M , ML Bontrager Line Dropper, 150mm travel, MaxFlow, internal routing, 34.9 mm, 410 mm length Size: L , XL , XXL TranzX JD-YSP39, 170 mm travel, internal routing, 34.9 mm Size: L , XL , XXL Bontrager Line Dropper, 170 mm travel, MaxFlow, internal routing, 34.9 mm, 450 mm length
Handlebar	Size: XS , S Bontrager Line, alloy, 35 mm, 27.5 mm rise, 750 mm width Size: M , ML , L , XL , XXL Bontrager Line, alloy, 35 mm, 27.5 mm rise, 780 mm width
Grips	Bontrager XR Trail Elite, nylon lock-on
Stem	Size: XS , S Bontrager Elite, 35 mm, 0-degree, 35 mm length Size: M , ML , L , XL , XXL Bontrager Elite, 35 mm, 0-degree, 45 mm length
Brake	Shimano 4-piston hydraulic disc, M6100 lever, M6120 calliper
Brake rotor	Size: XS , S , M , ML , L , XL , XXL Shimano RT66, 6-bolt, 203 mm Size: XS , S , M , ML , L , XL , XXL Shimano RT66, 6-bolt, 180 mm
Rotor size	Max brake rotor sizes - Frame: 203mm, Fork: see fork manufacturer
Weight
Weight	M - 15.91 kg / 35.08 lbs (with TLR sealant, no tubes)
Weight limit	This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).

Size Guide: Trek Fuel EX 8 XT Gen 6 (Mercury) 2025 Trail Bike

Frame Size	Rider Height* (metric)	Rider Height* (imperial)
X Small	145 - 155 cm	4'9" - 5'1"
Small	155 - 165 cm	5'1" - 5'5"
Medium	165 - 176 cm	5'5" - 5'9"
Medium/Large	173 - 180 cm	5'8" - 5'11"
Large	177 - 188 cm	5'10" - 6'2"
X Large	188 - 195 cm	6'2" - 6'5"
XX Large	195 - 203 cm	6'5" - 6'8"
*This is for guidance only. You may be taller or shorter, it doesn't mean our bikes will not fit you. The best way to determine the correct bike size for you is to try one. Please contact us if you are in any doubt about the correct bike size for you.