Trek Fuel MX: suspension setup & specs
The Trek Fuel MX is an all-mountain bike with 160–170 mm of fork travel and 150 mm at the rear. Here you will find all 8 current builds with fork, shock and shock size, plus matching SAG and tyre pressure starting values.
Calculate the setup for your Trek Fuel MX →
All builds
Fork, shock, shock size (eye-to-eye length × stroke) and rear travel, weight and price according to the manufacturer. Wheel size: 29" / 27.5" (Mullet).
| Build | Fork | Shock | Shock size | Rear travel | Weight | RRP | Calculator |
|---|---|---|---|---|---|---|---|
| 9 Eagle 90 Gen 7 | RockShox ZEB Ultimate (170 mm) | RockShox Vivid Ultimate | – | 150 mm | – | €5,499 | Setup → |
| 9 XT Gen 7 | FOX 36 Factory (160 mm) | FOX Float X Factory | – | 150 mm | – | €5,499 | Setup → |
| 9 XT Di2 Gen 7 | FOX 36 Factory (160 mm) | FOX Float X Factory | – | 150 mm | – | €5,949 | Setup → |
| 9 X0 AXS Gen 7 | RockShox ZEB Ultimate (170 mm) | RockShox Vivid Ultimate | – | 150 mm | – | €6,499 | Setup → |
| 9.8 Eagle 90 Gen 7 | RockShox ZEB Ultimate (170 mm) | RockShox Vivid Ultimate | – | 150 mm | – | €6,499 | Setup → |
| 9.8 XT Gen 7 | FOX 36 Factory (160 mm) | FOX Float X Factory | – | 150 mm | – | €6,499 | Setup → |
| 9.8 XT Di2 Gen 7 | FOX 36 Factory (160 mm) | FOX Float X Factory | – | 150 mm | – | €6,999 | Setup → |
| 9.9 X0 AXS Gen 7 | RockShox ZEB Ultimate (170 mm) | RockShox Vivid Ultimate | – | 150 mm | – | €8,499 | Setup → |
How it compares
160–170 mm at the fork almost exactly matches the 160 mm median of the 15 bikes in the “all-mountain bike” category in our database. Within Trek’s mountain bikes, it sits between the Trek Fuel EX and the Trek Fuel LX on travel. Depending on the build, the frame is aluminium or carbon.
At €5,499 for the 9 Eagle 90 Gen 7 build, pricing is typical for the category (median €5,500). The top build, 9.9 X0 AXS Gen 7, costs €8,499. 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 36 Factory.
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.
- 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 MX
The table converts the recommended SAG percentages into millimetres, so you can check them with the O-ring directly on the stanchion and on the shock shaft. Adjust the air pressure until the value is right. If Trek specifies its own target SAG for your model, that takes priority.
170 mm fork (9 Eagle 90 Gen 7, 9 X0 AXS Gen 7, 9.8 Eagle 90 Gen 7, 9.9 X0 AXS Gen 7)
| Riding style | Fork SAG |
|---|---|
| XC / touring | 17 % = 29 mm |
| Trail | 20 % = 34 mm |
| Enduro / rough | 22 % = 37 mm |
| Bike park | 20 % = 34 mm |
160 mm fork (9 XT Gen 7, 9 XT Di2 Gen 7, 9.8 XT Gen 7, 9.8 XT Di2 Gen 7)
| Riding style | Fork SAG |
|---|---|
| XC / touring | 17 % = 27 mm |
| Trail | 20 % = 32 mm |
| Enduro / rough | 22 % = 35 mm |
| Bike park | 20 % = 32 mm |
How to measure SAG is explained in our guide SAG setup.
Tyre pressure starting values
The values apply to 2.40″ wide tubeless tyres with a trail casing. With an inner tube add about 0.2 bar (2.9 psi), with an insert take off about 0.1 bar (1.5 psi).
| 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 suitable starting pressure on the sticker on the fork stanchion (or on the shock) or in the suspension manufacturers’ setup charts. Our calculator gives you a starting value including rebound for your weight and riding style. What matters afterwards is the measured SAG from the table above.
Sources
- Fuel MX 9 Eagle 90 Gen 7
- Fuel MX 9 XT Gen 7
- Fuel MX 9 XT Di2 Gen 7
- Fuel MX 9 X0 AXS Gen 7
- Fuel MX 9.8 Eagle 90 Gen 7
- Fuel MX 9.8 XT Gen 7
- Fuel MX 9.8 XT Di2 Gen 7
- Fuel MX 9.9 X0 AXS Gen 7