What tyre pressure should a trailer have?
The correct tyre pressure for a trailer depends on the tyre size, tyre type, axle load, and how the trailer is loaded. Too little or too much pressure can affect handling, increase stopping distances, and cause uneven tyre wear. Always follow the manufacturer’s specification for your specific tyre and trailer combination.
Why does correct tyre pressure matter on a trailer?
Correct tyre pressure ensures the trailer runs stably and that the tyres wear evenly. Under-inflated tyres generate more heat, increase rolling resistance, and wear faster at the shoulders. Over-inflated tyres reduce the contact patch with the road, make the trailer feel harsher on uneven surfaces, and cause wear in the centre of the tread. Both extremes affect braking performance and overall safety.
Where do you find the correct tyre pressure for your trailer?
The correct value is found in the trailer manufacturer’s documentation, on a sticker on the trailer itself, or in the tyre manufacturer’s load and pressure tables for the specific tyre size. The rated axle load and the approved tyre size are both relevant – always use the figures that apply to your actual trailer and tyres. Rules vary by country, so always check local regulations and manufacturer requirements.
How often should you check trailer tyre pressure?
Check the tyre pressure regularly – particularly before longer journeys, when carrying a heavy load, and after the trailer has been standing unused for an extended period. Temperature changes also affect pressure, so a check at the start of each season is good practice. If your trailer has a spare wheel, check that too.
Should tyre pressure be adjusted when the trailer is fully loaded?
Yes – some trailers require a higher tyre pressure when loaded than when empty. Check the manufacturer’s recommendation for both loaded and unloaded conditions. The pressure should always match the actual use of the trailer and stay within the tyre’s rated load capacity.
How do you measure tyre pressure correctly?
Always measure tyre pressure when the tyres are cold – before the trailer has been driven any significant distance. Use a reliable pressure gauge and check each tyre individually. A reading taken on warm tyres will be higher than the true cold pressure and can lead to under-inflation in practice.
What are the consequences of incorrect tyre pressure?
Too low: The trailer becomes unstable, tyres overheat, shoulder wear increases, and the risk of tyre damage rises. Fuel consumption of the towing vehicle also increases due to higher rolling resistance.
Too high: Grip is reduced, the tyre wears in the centre, and the trailer handles more harshly on uneven roads.
In severe cases, incorrect tyre pressure can compromise road safety. Correct pressure is therefore an important part of routine maintenance – alongside checking the wheel nut torque and inspecting the wheel bearings.
Tyre pressure, seasons and winter use
Cold weather causes tyre pressure to drop, so checks are especially important during autumn and winter. For safe towing in all conditions, functioning trailer lighting is also essential – visibility and braking go hand in hand.
Summary
Correct tyre pressure is essential for safe towing, even tyre wear, and stable handling. The right value depends on your tyre size, trailer, and load – always refer to the manufacturer’s specification. Check pressure when the tyres are cold and make it a regular part of your trailer maintenance routine.