2025 Trek Top Fuel 8 Gen 4- Matte Dark Web
The Top Fuel 8 Gen 4 is a nimble alloy trail bike that strikes a balance between quick climbing efficiency and descending confidence. It packs in a versatile 130 mm front and 120 mm rear travel for ripping over rocks and roots without sacrificing power on ascents. It's built from lightweight Alpha Platinum Aluminium that helps save your budget for bike trips, but packs in upgrades where they matter, like a 12-speed Shimano XT and SLX drivetrain, and a Fox Rhythm 34 fork.
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OVERVIEW
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SPECS
It's right for you if...
You want an alloy full suspension that's ready to rip. You like to ride everything from cross-country hot laps to all-mountain adventures, and you need a bike that's light, versatile and confident. You've got an appreciation for the durability of aluminium, but want upgrades where they matter, like your drivetrain and suspension.
The tech you get
An Alpha Platinum Aluminium frame equipped with a 4-way Mino Link lower shock mount for tweaking geometry and suspension leverage rate. A 130 mm FOX Rhythm 34 fork with Float EVOL air spring and GRIP damper, plus 120 mm of rear travel from a FOX Performance Float shock with a 3-position damper. It's topped off with a Shimano XT/SLX 12-speed group set, hydraulic disc brakes, a Bontrager Line dropper post and Tubeless Ready Bontrager Line Comp 30 wheels.
The final word
The Top Fuel 8 Gen 4 is ready to cut loose from all-day climbs to rooty descents. It balances capability and efficiency, with just enough travel to keep the ride smooth without eating up your pedalling power. It gives you the perfect blend of affordability, with a rugged alloy frame and upgrades where they matter, like the Shimano XT/SLX drivetrain.
Why you'll love it
Its lightweight frame and versatile geometry make it the perfect choice for all kinds of rides and all kinds of riders
The 4-way Mino Link makes it easy to adjust your geometry or leverage rate for how and where you want to ride
You get a sweet balance of price and performance with upgraded components and a rugged alloy frame
The Alpha Platinum Aluminium frame is robust, yet light, and packs in updated internal frame storage for easy access to gear and snacks
It's more upgrade-ready than ever, with room for bigger 140 mm forks and longer-stroke shocks for up to 130 mm of rear travel, plus room for extra-long dropper posts
*Please note – spec applies to all sizes unless listed separately
Frameset
Frame Alpha Platinum Aluminium, internal storage, tapered head tube, internal guided routing, downtube guard, OCLV Next rocker link, Mino 4 link, ABP, Boost148, 120 mm travel
Fork Fox Rhythm 34, Float EVOL air spring, GRIP damper, tapered steerer, 44 mm offset, Boost110, 15 mm Kabolt axle, 130 mm travel
Shock Fox Performance Float DPS, 2-position damper, 185 mm x 50 mm
Max compatible fork travel 140 mm
Wheels
*Wheel front Size: S
Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle, 27.5"
Size: M, ML, L, XL
Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle, 29"
*Wheel rear Size: S
Bontrager Line Comp 30, High Strength 6000 Series Aluminium rim, Tubeless-Ready, Rapid Drive 108, 6-bolt, Shimano MicroSpline freehub, Boost148, 12 mm thru axle, 27.5"
Size: M, ML, L, XL
Bontrager Line Comp 30, High Strength 6000 Series Aluminium rim, Tubeless-Ready, Rapid Drive 108, 6-bolt, Shimano MicroSpline freehub, Boost148, 12 mm thru axle, 29"
Skewer rear Bontrager Switch thru-axle, removable lever
*Tyre Size: S
Bontrager Gunnison Pro XR, Tubeless-Ready, wire bead, 60 tpi, 27.5x2.40"
Size: M, ML, L, XL
Bontrager Gunnison Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi, 29x2.40"
Tyre part Bontrager TLR sealant, 180 ml/6 oz
Max tyre size Frame: 29x2.50", Fork: See manufacturer
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 SLX M7100, 10-51T, 12-speed
Chain Shimano SLX M7100, 12-speed
Max. chainring size 1x: 34T, min 30T
Components
Saddle Bontrager Verse P3, chromoly rails
*Seatpost Size: S
Bontrager Line Dropper, 100mm travel, MaxFlow, internal routing, 34.9 mm, 310mm length
Size: M, ML, L, XL
Bontrager Line Dropper, 170 mm travel, MaxFlow, internal routing, 34.9 mm, 450 mm length
Handlebar Bontrager Line, alloy, 35 mm, 27.5 mm rise, 780 mm width
Grips Bontrager XR Trail Comp, nylon lock-on
Stem Bontrager Elite, 35 mm, 0-degree, 45 mm length
Brake Shimano 4-piston hydraulic disc, M6100 lever, M6120 calliper
Brake rotor Shimano RT66, 6-bolt, 180 mm
Rotor size Max brake rotor sizes – Frame: 200 mm, min 180 mm, Fork: see fork manufacturer
Accessories
Bag Bontrager BITS Internal Frame Storage Bag
Weight
Weight limit This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).
We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colours, materials and pricing. Due to supply chain issues, compatible parts may be substituted at any time without notice.
Bike and frame weights are based on pre-production painted frames at time of publication. Weights may vary in final production.
Shipping
We aim to have each order fulfilled and shipped within 3-5 working days after your order being paid.
Link to your shipping policy.
Delivery
Shop online at biket and choose between 2 convenient delivery options.
Click and collect your orders in store.
Door-to-door courier countrywide.
Refunds
Please note we do not offer straight refunds, these are issued as store credits only.
WHO ARE WE
Biket is one of South Africas Top Online Cycling Stores, based in Hillcrest, KZN.
We offer a range of the highest quality cycling products from Trek bikes, Giant bikes, Scott bikes, Bontrager & Oakley apparel, and a full service centre. Our aim is to offer the highest quality cycling products paired with the best advice.
Looking for something in one of our brands you can't find on the online store, drop us a message and we will assist.
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