Trek Fuel LX: suspension setup & specs
The Trek Fuel LX is an enduro bike with 170 mm of fork travel and 160 mm at the rear. This page lists the 8 current builds with fork, shock and shock size and gives matching starting values for SAG and tyre pressure.
Calculate the setup for your Trek Fuel LX →
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 |
|---|---|---|---|---|---|---|---|
| 9 Eagle 90 Gen 7 | RockShox ZEB Ultimate (170 mm) | RockShox Vivid Ultimate | – | 160 mm | – | €5,699 | Setup → |
| 9 XT Gen 7 | FOX 38 Factory (170 mm) | FOX DHX2 (coil) | – | 160 mm | – | €5,699 | Setup → |
| 9 XT Di2 Gen 7 | FOX 38 Factory (170 mm) | FOX DHX2 (coil) | – | 160 mm | – | €6,199 | Setup → |
| 9 X0 AXS Gen 7 | RockShox ZEB Ultimate (170 mm) | RockShox Vivid Ultimate | – | 160 mm | – | €6,699 | Setup → |
| 9.8 Eagle 90 Gen 7 | RockShox ZEB Ultimate (170 mm) | RockShox Vivid Ultimate | – | 160 mm | – | €6,699 | Setup → |
| 9.8 XT Gen 7 | FOX 38 Factory (170 mm) | FOX DHX2 (coil) | – | 160 mm | – | €6,699 | Setup → |
| 9.8 XT Di2 Gen 7 | FOX 38 Factory (170 mm) | FOX DHX2 (coil) | – | 160 mm | – | €7,199 | Setup → |
| 9.9 X0 AXS Gen 7 | RockShox ZEB Ultimate (170 mm) | RockShox Vivid Ultimate | – | 160 mm | – | €8,699 | Setup → |
How it compares
170 mm at the fork almost exactly matches the 170 mm median of the 41 bikes in the “enduro bike” category in our database. The fork has 10 mm more travel than the rear end with 160 mm – a common layout that takes load off the front on steep terrain. No other Trek model among its mountain bikes has more travel up front. The frame is available in aluminium or carbon.
With a starting price of €5,699 (9 Eagle 90 Gen 7), the Trek Fuel LX is above the category median (€4,750). The top build, 9.9 X0 AXS Gen 7, costs €8,699. Depending on the build, fork and shock come from FOX and RockShox. The fork line-up ranges from the RockShox ZEB Ultimate to the FOX 38 Factory. The 9 Eagle 90 Gen 7 build uses a coil shock (RockShox Vivid Ultimate), so SAG is set with the spring rate rather than air pressure.
Setup notes for this spec
- Air fork (RockShox ZEB Ultimate): 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.
- Coil shock (RockShox Vivid Ultimate): SAG is determined by the spring rate. Only add enough preload to stop the spring from rattling.
- Shock (RockShox Vivid Ultimate): get on the bike in your normal riding position, step off carefully and read the O-ring. Always cycle the shock a few times after pumping.
Target SAG for the Trek Fuel LX
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.
170 mm fork (all builds)
| Riding style | Fork SAG |
|---|---|
| XC / touring | 17 % = 29 mm |
| Trail | 20 % = 34 mm |
| Enduro / rough | 22 % = 37 mm |
| Bike park | 20 % = 34 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
You will find a guide value for air pressure on the fork sticker (or on the shock) or in the suspension makers’ charts. Our calculator also takes riding style and rebound into account. In the end, measured SAG is what counts.
Sources
- Fuel LX 9 Eagle 90 Gen 7
- Fuel LX 9 XT Gen 7
- Fuel LX 9 XT Di2 Gen 7
- Fuel LX 9 X0 AXS Gen 7
- Fuel LX 9.8 Eagle 90 Gen 7
- Fuel LX 9.8 XT Gen 7
- Fuel LX 9.8 XT Di2 Gen 7
- Fuel LX 9.9 X0 AXS Gen 7