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The Top Fuel 9 Gen 4 is an alloy trail bike that's ready to billy-goat up long climbs and rip back to the bottom for another lap.
The Top Fuel 9 Gen 4 is an alloy trail bike that's ready to billy-goat up long climbs and rip back to the bottom for another lap.
Trek

Trek Top Fuel 9 Gen 4 Full Suspension Mountain Bike 2025 in Juniper Green

£3,589.00 £4,500.00 20% off
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With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

Your Pre-Order is prioritised (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or despatch to you — it often never even hits the stock room shelves!

Pre-Launch

With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

Estimated Delivery & Collection Dates

Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery & Collection Dates provided on product pages.

We estimate this will be ready for despatch to you or collection via Click & Collect on Undetermined
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Hassle free returns

In the unlikely event that you are not satisfied with your purchase please feel free to return your items within 90 days of the purchase date for a full exchange or refund. Any item (excluding food, underwear or e-gift vouchers) can be returned to us for any reason within 90 days, provided that the item has not been used or fitted and is returned in its original packaging with valid proof of purchase.

It is recommended that you use a recorded delivery service or return to a store to ensure your items are received by us. We cannot assume responsibility for items that are lost in transit back to us.




Terms & Conditions

Items must be returned in their original packaging and unused. Refunds will be issued once the product(s) have been received and inspected.

Click & Collect customers can buy with confidence knowing that they can review the item before deciding whether it is right for you before leaving the store. Should you decide it's not right for you, it can be conveniently exchanged or refunded straight away, or you still have up to 90 days to return it if you are still unsure.

Please note:
1. If the items we have sent you are faulty, damaged or not as we described, we will cover the cost of collection and the delivery of the correct item.

2. If we have delivered the correct bike but upon inspection, you decide the bike is not the one for you, we will charge you £50 for collection (£100 from Northern Ireland). If you do not have the original box in usable condition, we will charge you an additional £15 to provide one.

Refunds will be processed using the same method of payment used for the original purchase. Credit & debit card refunds must be made to the card used for the original purchase.

We are unable to offer a refund without a valid proof of purchase.

Trek Top Fuel 9 Gen 4 Full Suspension Mountain Bike 2025 in Juniper Green

Season:2025Sale

Brand:Trek

Code:46144GRN

The Top Fuel 9 Gen 4 is an alloy trail bike that's ready to billy-goat up long climbs and rip back to the bottom for another lap. It gives you the rugged benefits of a lightweight aluminium frame, plus the upgrades you crave, like fully wireless shifting from SRAM's GX Eagle AXS transmission, 4-piston hydraulic brakes and a 120 mm/130 mm FOX suspension package.

It's right for you if...
You like balance in most things you do – a combination of climbing power and descending confidence, nimble handling and full-suspension comfort, bike budget and component performance. You like the durability and affordability that an alloy frame offers and want upgrades where they matter most.

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 DPS shock with a 3-position damper. It's topped off with a wireless electronic SRAM GX Eagle transmission, 4-piston hydraulic disc brakes, a Bontrager Line dropper post and Tubeless Ready Bontrager Line Comp 30 wheels.

The final word
The Top Fuel 9 Gen 4 is built for those who want the best of both worlds. It's a great choice for all-around trail riders who may start the day with a pedal fest, but end it with long descents. It delivers on upgrades where you want them most, like your suspension and group set, but keeps the price down with an alloy frame.

Key Features & Benefits:

  • Hydraulic Disc Brakes:Accurate and powerful braking capacity to keep you in control in all weather conditions.
  • All-mountain ripper:The sweetest alloy build with a fully wireless SRAM transmission, upgraded suspension and a light yet rugged frame
  • Mino Link:4-way Mino Link makes it easy to adjust your geometry or leverage rate for how and where you want to ride

Full Specification:

  • 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
  • Rear Shock:Fox Performance Float DPS, 2-position damper, 185 mm x 50 mm
  • Fork:Fox Rhythm 34, Float EVOL air spring, GRIP damper, tapered steerer, 44 mm offset, Boost110, 15 mm Kabolt axle, 130 mm travel
  • Number of Gears:12
  • Gear Shifters:SRAM AXS POD
  • Chainset:SRAM GX Eagle, T-Type, DUB, 30T, 55 mm chain line, 170 mm length
  • Chainrings:30T
  • Rear Cassette:SRAM Eagle XS-1275, T-Type, 10-52, 12-speed
  • Chain:SRAM GX Eagle, T-Type, 12-speed
  • Rear Derailleur:SRAM GX Eagle AXS, T-Type
  • Bottom Bracket:SRAM DUB MTB Wide, 73 m, BSA threaded
  • Pedals:Not supplied:Shop pedals here
  • Rims:Bontrager TLR
  • Front Hub: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"
  • Rear Hub:Bontrager Line Comp 30, Tubeless-Ready, Rapid Drive 54, 6-bolt, Boost148, 12 mm thru axle
  • Front 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"
  • Rear 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"
  • Brakes:SRAM Level Bronze 4-piston hydraulic disc
  • Handlebars:Bontrager Line, alloy, 35 mm, 27.5 mm rise, 780 mm width
  • Handlebar Grips:Bontrager XR Trail Comp, nylon lock-on
  • Stem:Bontrager Elite, 35 mm, 0-degree, 45 mm length
  • Saddle:Verse Short Comp, steel rails, 145 mm width
  • 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
  • Weight:M - 14.38 kg / 31.71 lbs (with TLR sealant, no tubes), This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).
Manufacturers reserve the right to change specifications without notice based on availability at the point of assembly.

Size Guide for Trek Top Fuel

SizeRider HeightRider HeightInseamInseam
S155 - 165 cm5'1" - 5'5"74 - 78 cm29" - 31"
M165 - 176 cm5'5" - 5'9"79 - 83 cm31" - 33"
M/L173 - 180 cm5'8" - 5'11"81 - 86 cm32" - 34"
L177 - 188 cm5'10" - 6'2"84 - 89 cm33" - 35"
XL188 - 195 cm6'2" - 6'5"89 - 91 cm35" - 36"
2XL195 - 203 cm6'5" - 6'8"91 - 97 cm36" - 38"

Geometry Information for Trek Top Fuel Gen 4

Geometry Information for Trek Top Fuel Gen 4

Frame size letterSSMMMLMLLLXLXL
Geometry positionHighLowHighLowHighLowHighLowHighLow
Wheel size29"29"29"29"29"29"29"29"29"29"
A — Seat tube36364141424243.543.54747
B — Seat tube angle69.5°69.0°70.5°70.0°70.5°70.0°70.5°70.0°70.5°70.0°
Effective seat tube angle76.5°76.0°77.3°76.9°76.6°76.2°76.3°75.9°75.6°75.2°
C — Head tube length10.510.510.510.5111111.511.513.513.5
D — Head angle65.9°65.5°65.9°65.5°65.9°65.5°65.9°65.5°65.9°65.5°
E — Effective top tube55.855.958.758.861.161.26363.167.267.3
G — Bottom bracket drop11.62.63.22.63.22.63.22.63.2
H — Chainstay length43.443.543.443.543.94443.94444.444.5
I — Offset4.34.34.34.34.34.34.34.34.34.3
J — Trail11.111.512.112.512.112.512.112.512.112.5
K — Wheelbase115115.1118.8118.8121121122.7122.7127127.1
L — Standover70.57075.57575.5757675.576.576
M — Frame reach42.241.745.244.746.746.248.247.751.250.7
N — Frame stack56.65759.960.360.460.760.861.262.663

Warranty Information for Trek:

Lifetime warranty on Frame sets (frame and rigid fork), main frame and full suspension swing arms for the lifetime of the original owner, and Bontrager wheels with carbon rims.

2-year warranty on Rear suspension linkage components, including bearings, rocker link and accompanying hardware and components, Bontrager wheels with alloy rims, Paint and transfers.

For full warranty policy please visit trekbikes.com

Sizing Information
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