Transition Spire: suspension setup & specs
The Transition Spire is an enduro bike with 170 mm of fork travel and 170 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 Transition Spire →
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 |
|---|---|---|---|---|---|---|---|
| Alloy Eagle 70 | RockShox Domain Gold RC (170 mm) | RockShox Super Deluxe Base | 205x65 | 170 mm | – | €4,199 | Setup → |
| Alloy Eagle 90 | RockShox ZEB Ultimate (170 mm) | RockShox Super Deluxe Ultimate | 205x65 | 170 mm | – | €5,899 | Setup → |
| Carbon Eagle 90 (C1) | RockShox ZEB Ultimate (170 mm) | RockShox Vivid Ultimate | 205x65 | 170 mm | – | €7,799 | Setup → |
| Carbon Eagle 90 (D1) | RockShox ZEB Ultimate (170 mm) | RockShox Vivid Ultimate | 205x65 | 170 mm | – | €7,799 | 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. Travel is the same front and rear at 170 mm each. Within Transition’s mountain bikes, it sits between the Transition Sentinel and the Transition TR11 on travel. Depending on the build, the frame is aluminium or carbon.
At €4,199 for the Alloy Eagle 70 build, pricing is typical for the category (median €4,750). For the Carbon Eagle 90 (D1) build, Transition asks €7,799. Transition uses RockShox suspension throughout. In total, 2 different forks are used, from the RockShox Domain Gold RC to the RockShox ZEB Ultimate.
Setup notes for this spec
- Air fork (RockShox Domain Gold RC): 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 RockShox adjuster fully closed first and count clicks from there – that way you can note settings and restore them later.
- Air shock (RockShox Super Deluxe Base): 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 Transition Spire
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 Transition specifies its own target SAG for your model, that takes priority.
170 mm fork, 65.0 mm shock stroke (all builds)
| Riding style | Fork SAG | Shock SAG |
|---|---|---|
| XC / touring | 17 % = 29 mm | 24 % = 15.6 mm on the shock shaft |
| Trail | 20 % = 34 mm | 28 % = 18.2 mm on the shock shaft |
| Enduro / rough | 22 % = 37 mm | 30 % = 19.5 mm on the shock shaft |
| Bike park | 20 % = 34 mm | 27 % = 17.6 mm on the shock shaft |
How to measure SAG is explained in our guide SAG setup.
Tyre pressure starting values
The values apply to 2.50″ 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). Stock tyres: 3C EXO/TR (2.5) / 3C EXO/TR (2.4); Maxxis Assegai / Maxxis Minion DHRII; Radial, Trail Pro, Ultra Soft (2.5) / Radial, Gravity Pro, Soft (2.5); Schwalbe Magic Mary / Schwalbe Albert.
| 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.