Ifor Williams TB4621-302
Tyre pressures and wheel nut / bolt torque
Tyre specification
Fitment details
- For the P0876 195/55R10C 98N assembly on a 6.00 x 10 four-bolt steel rim.
- 88 Nm applies to the four-bolt steel wheel with M12 bolts (normally a 19 mm socket).
- Use clean, dry threads and seating surfaces.
- Optional alloy wheels are not covered.
- The placard uses the current manufacturer website weight.
- The April 2022 brochure lists 765 kg with removable or hinged skids, or 800 kg with mesh ramp; these are different configuration/date specifications.
- Internal bed: 4.64 m long x 2.04 m wide; overall: 6.17 m long x 2.04 m wide.
- Weights depend on the production specification and fitted equipment; check the trailer plate and supplied documents.
Tyre pressure placard
Official TB4621-302 photograph with removable skids and wheel chocks; other twin-axle TB models differ in length and wheels.
| Tyre size | kPa | PSI | bar |
|---|---|---|---|
| 195/55R10C | 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 TB4621-302 trailer with 195/55R10C tyres?
The tyre pressure for the Ifor Williams TB4621-302 trailer with 195/55R10C tyres is 90 PSI (6.2 bar / 620 kPa), measured cold. This applies to the P0876 98N tyre assembly on the 6.00 x 10 steel rim.
What is the wheel nut or bolt torque for the Ifor Williams TB4621-302 trailer?
The wheel nut or bolt torque for the Ifor Williams TB4621-302 trailer is 88 Nm. This setting applies to the four-bolt steel wheel with M12 wheel bolts (normally a 19 mm socket).