Trek Top Fuel: suspension setup & specs
The Trek Top Fuel is a downcountry bike with 130 mm of fork travel and 120 mm at the rear. Here you will find all 4 current builds with fork, shock and shock size, plus matching SAG and tyre pressure starting values.
Calculate the setup for your Trek Top Fuel →
All builds
Fork, shock, shock size (eye-to-eye length × stroke) and rear travel, weight and price according to the manufacturer. Wheel size: 29.
| Build | Fork | Shock | Shock size | Rear travel | Weight | RRP | Calculator |
|---|---|---|---|---|---|---|---|
| 8 Gen 4 | FOX 34 Rhythm (130 mm) | FOX Float Performance | – | 120 mm | – | €3,499 | Setup → |
| 9.8 XT Di2 Gen 4 | RockShox Pike Select+ (130 mm) | RockShox Deluxe Ultimate RCT | – | 120 mm | – | €5,999 | Setup → |
| 9.9 XTR Di2 Gen 4 | FOX 36 SL Factory (130 mm) | FOX Float Factory | – | 120 mm | – | €8,499 | Setup → |
| 9.9 XX AXS Gen 4 | RockShox Pike Ultimate (130 mm) | RockShox Deluxe Ultimate RCT | – | 120 mm | – | €11,499 | Setup → |
How it compares
On travel, the Trek Top Fuel is right where the “downcountry bike” category usually is: 130 mm up front against a median of 130 mm from 13 bikes. The fork has 10 mm more travel than the rear end with 120 mm – a common layout that takes load off the front on steep terrain. Within Trek’s mountain bikes, it sits between the Trek Procaliber and the Trek Fuel EX on travel. Depending on the build, the frame is aluminium or carbon.
Entry costs €3,499 for the 8 Gen 4 build – less than the category median of €5,000. The top build, 9.9 XX AXS Gen 4, costs €11,499. For suspension, Trek combines components from FOX and RockShox. The fork line-up ranges from the FOX 34 Rhythm to the RockShox Pike Ultimate.
Setup notes for this spec
- Air fork (FOX 34 Rhythm): the air valve is on top of the left leg under a cap. Change pressure in small steps (about 5 psi (0.34 bar)) and cycle the fork a few times afterwards so the air chambers can equalise.
- Rebound: turn the red FOX and RockShox adjuster fully closed first and count clicks from there – that way you can note settings and restore them later.
- Air shock (FOX Float Performance): measure SAG in your riding position, ideally with a helper holding the bike. Cycle the shock a few times after every pressure change.
Target SAG for the Trek Top Fuel
SAG is the share of travel your weight already uses in the riding position. The table gives it straight in millimetres – read the O-ring on the stanchion and on the shock shaft and adjust the air pressure until it matches. Any figures from Trek take priority.
130 mm fork (all builds)
| Riding style | Fork SAG |
|---|---|
| XC / touring | 17 % = 22 mm |
| Trail | 20 % = 26 mm |
| Enduro / rough | 22 % = 29 mm |
| Bike park | 20 % = 26 mm |
How to measure SAG is explained in our guide SAG setup.
Tyre pressure starting values
For 2.40″ wide tyres, tubeless with a trail casing. With an inner tube about 0.2 bar (2.9 psi) more, with an insert about 0.1 bar (1.5 psi) less.
| Ready-to-ride weight | Front | Rear |
|---|---|---|
| 60 kg | 1.43 bar (21 psi) | 1.63 bar (24 psi) |
| 70 kg | 1.55 bar (22 psi) | 1.75 bar (25 psi) |
| 80 kg | 1.67 bar (24 psi) | 1.87 bar (27 psi) |
| 90 kg | 1.79 bar (26 psi) | 1.99 bar (29 psi) |
| 100 kg | 1.91 bar (28 psi) | 2.11 bar (31 psi) |
| 110 kg | 2.03 bar (29 psi) | 2.23 bar (32 psi) |
| 120 kg | 2.15 bar (31 psi) | 2.35 bar (34 psi) |
Air pressure in the fork and shock
The sticker on the fork (or on the shock) and the manufacturers’ setup charts give you a first pressure. Our calculator is more precise and suggests rebound too – always check the result via SAG.