Ifor Williams TT2515 Manual
Tyre pressures and wheel nut / bolt torque
Tyre specification
Fitment details
- 165R13C: For 8PR 94/92N commercial tyres on the four-bolt steel wheel.
- Lower-rated 6PR tyres are not covered.
- 155/70R12C: For 104/102N commercial tyres on the specified tipper wheel assembly.
- Other rim widths or applications can require a different setting.
- 88 Nm applies to the four-bolt steel wheel with M12 thread wheel bolts (normally a 19 mm socket); 110 Nm applies to the five-bolt steel wheel with M14 thread wheel bolts (normally a 19 mm socket).
- Use clean, dry threads and seating surfaces.
- Optional alloy wheels are not covered.
- Internal bed: 2.46 m x 1.49 m.
- Fitted accessories can change unladen weight; check the trailer plate and supplied specification.
Choose the setting for the confirmed wheel fixing.
Socket size alone does not identify the thread.
Alloy wheels are not covered by these settings.
Tyre pressure placard
Illustrative Ifor Williams twin-axle tipper range visual reference. Equipment and dimensions vary by specification.
| Tyre size | kPa | PSI | bar |
|---|---|---|---|
| 165R13C | 450 | 65 | 4.5 |
| 155/70R12C | 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
See tyre-size settings
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 TT2515 Manual tipper trailer with 165R13C tyres?
The tyre pressure for the Ifor Williams TT2515 Manual tipper trailer with 165R13C tyres is 65 PSI (4.5 bar / 450 kPa), measured cold. For 8PR 94/92N commercial tyres on the four-bolt steel wheel. Lower-rated 6PR tyres are not covered.
What is the tyre pressure for the Ifor Williams TT2515 Manual tipper trailer with 155/70R12C tyres?
The tyre pressure for the Ifor Williams TT2515 Manual tipper trailer with 155/70R12C tyres is 90 PSI (6.2 bar / 620 kPa), measured cold. For 104/102N commercial tyres on the specified tipper wheel assembly. Other rim widths or applications can require a different setting.
What is the wheel nut or bolt torque for the Ifor Williams TT2515 Manual tipper trailer?
The wheel nut or bolt torque for the Ifor Williams TT2515 Manual tipper trailer depends on the fitted fixing. M12 · 19 mm: 88 Nm; M14 · 19 mm: 110 Nm. 88 Nm applies to the M12 · 19 mm fixing; 110 Nm applies to the M14 · 19 mm fixing. Confirm the fitted wheel fixing before tightening.