Ifor Williams GX106 Ramp
Tyre pressures and wheel nut / bolt torque
Tyre specification
Fitment details
- One GX106 page covers ramp and skid versions.
- The P0878 155/70R12C GP/GX assembly uses 90 PSI and 110 Nm with five M14 steel-wheel bolts (normally a 19 mm socket).
- Internal bed: 3.03 m × 1.84 m; overall: 5.05 m × 2.30 m.
Tyre pressure placard
Ifor Williams GX106 Ramp trailer visual reference.
| Tyre size | kPa | PSI | bar |
|---|---|---|---|
| 155/70R12C 104/102N | 620 | 90 | 6.2 |
Please ensure the maximum pressure marked on your tyre sidewall is equal to or higher than the pressure listed here.
A tyre of the same size with a lower pressure rating may have been fitted by mistake.
Never exceed the maximum pressure marked on the tyre.
Is your tyre load rating high enough?
Find the load index beside the tyre size. For example, 104 = 900 kg per tyre. For normal trailer wheels, use the first number in 104/102N. The second is for tyres mounted side by side on one hub, not a trailer with two axles. N is the speed symbol.
Open the tyre load rating conversion chart →
Capacity per tyre × number of road tyres = combined tyre capacity. Do not count the spare or jockey wheel.
Example: four tyres rated 104 give 900 × 4 = 3,600 kg, which exceeds a 3,500 kg trailer maximum gross weight by 100 kg. This is a total-capacity comparison only.
Check your tyre capacity
Enter all three values to compare capacity.
Check every axle too: its tyres must support its plated maximum axle weight, and no individual tyre may be overloaded. This calculator assumes all tyres have the same load index and are mounted singly. It does not confirm fitment or set tyre pressure. Keep the trailer manufacturer’s required load and speed ratings, use the specified cold pressure and check the actual loaded axle weights.
Cold tyre pressure
90 PSI / 6.2 bar / 620 kPa
A separate unloaded or fully laden pressure has not been confirmed for this entry.
Wheel nut / bolt torque
Use the setting only for the wheel and fixing specification described above.
Frequently asked questions
What is the tyre pressure for the Ifor Williams GX106 Ramp plant trailer with 155/70R12C 104/102N tyres?
The tyre pressure for the Ifor Williams GX106 Ramp plant trailer with 155/70R12C 104/102N tyres is 90 PSI (6.2 bar / 620 kPa), measured cold. Use only the P0878 155/70R12C 104/102N assembly at 90 PSI. Never exceed the maximum pressure marked on the tyre sidewall.
What is the wheel nut or bolt torque for the Ifor Williams GX106 Ramp plant trailer?
The wheel nut or bolt torque for the Ifor Williams GX106 Ramp plant trailer is 110 Nm. This applies only to the confirmed steel-wheel assembly paired with the selected tyre. Optional alloy wheels are not covered.