Take the figure for the maximum pressure for the tyre and divide it by the maximum weight from the table above. Once you have the MTPLM of your caravan and the maximum pressure for your tyre we can now work out the correct tyre pressure.

It will say something like “MAXIMUM LOAD 720 KG MAXIMUM PRESSURE 52 PSI” it might have the pressure given in Bar. This is usually located on the side wall below the tyre data in smaller text. The other bit of information we need to know from the tyre is the Maximum Tyre Inflation Pressure and Load. The recommendation from the tyre industry though is you should never exceed 90% of the tyre’s load index, so in this case the maximum axle weight would be 1206 kg. Remember that is the load for ONE TYRE… so on a single axle those two tyres could carry a maximum load of 1340 kg. So in our tyre data example from above, we can see that a load index of “94” means the maximum load for the tyre is 670 kg. The first thing to check is the tyres are rated for the MTPLM of your caravan, so we need to know the load index ratings.įrom the table above, you will be able to cross reference the load rating code number to the actual maximum permissible load the tyre is rated for.

The load rating for the tyre can range from 60 to 130 which equates to a maximum load per tyre of between 250 kg to 1900 kg. The next number “94” is the load rating – more of this in a moment and finally the last letter “H” is the speed rating for the tyre.Ī full explanation can be found on many tyre manufacturers websites, for example here is Continentals page: The next letter “R” is the construction, in this case Radial, the following number “15” is the rim diameter (in inches). The second number is the Aspect Ratio which means in this case the tyre wall height is 65% of the width. The first part of the number is the tyre width, in this case 205 mm wide. You first need to be able to decipher the code on the tyre wall… this is a typical code: As the load in your caravan can change or on older caravans, the tyre size might have changed it’s worth knowing how to calculate the correct pressure from the markings on the tyres fitted to your caravan. Your Caravan Handbook usually quotes the tyre pressure for the original tyre size fitted and the caravan loaded to the MTPLM (Maximum Technical Permitted Laden Mass). Unfortunately this is not always the case with all caravans. On your tow vehicle, there is usually a sticker conveniently located in the door frame or fuel filler cap reminding you of the correct tyre pressure. The simple fact is caravan tyres often get overlooked and are not checked regularly. One of the most important safety aspects of towing is having the correct tyres fitted on your caravan and just as important having the tyres inflated to the correct pressure.

600 psi to bar