Trailer and Caravan Wheel Bolt Tightening Nominal section width - on radial tyres this is expressed in millimetres, on cross ply tyres, inches are used. Retreads - must also show either 'RETREAD' or 'REMOULD' on the sidewall, together with 'BSAU 144' in place of ECE Type Approval Mark.Īspect ratio - ratio between the height of the sidewall and the width of the tread, expressed as a percentage. The illustration below provides an explanation of the markings currently found on a tyre sidewall. See links above for detailed tables on Tyre Load Index, Tyre Speed Symbols and Tyre Load & Pressure Ratings. (Make sure that the tyres you fit to your trailer are of the correct rating.) Additional Tyre information: Tyres must be free from deep cuts and bulges (which indicate they are breaking up) and it is illegal to use cross-ply and radial tyres on the same axle. Trailer and Caravan Tyre Markings & Condition:Ĭar, caravan and trailer tyres must have at least 1.6mm of tread over the central 75% of their width for their entire circumference, although a tyre with under 3mm offers little grip in the wet.
Trailer and Caravan Tyre Load & Pressure RatingsĪ table covering popular trailer sizes is given below.
