Tyre pressure too high?

Posted on 26/11/2020 09:44 by ScionRed

I have a Hymercar and find the ride quality is quite harsh so have been doing some research online, one of the things people talk about is having the tyre pressure too high. 

I haven’t weighed my van yet but the Hymer manual says the tyre pressure should be 3.75 bar on the Front and 4.3 bar on the rear. I have contacted the tyre manufacturer and they have provided me tyre chart. This show that a front tyre pressure of 3.75 bar would be required for a front axle load of circa 1965 kg and a rear tyre pressure of 4.3 bar would be required for a rear axle load of circa 2170 kg.

However, even my vans max axle weights (front axle max of 1850kg and a rear axle max 2000kg) are way below this. 

So my question is should I take my van to a weighbridge and once I have the actual weights reduce my tyre pressure accordingly?

 

Thanks for any advice.

Posted on 26/11/2020 16:53 by LLM

Don't experiment, that could be dangerous.  Put your van into travelling trim, i.e. with everything you would normally carry including passenger(s), about 90% fuel and your normal amount of fresh water.  Get it weighed, total and both axles.  Armed with that info ask your tyre manufacturer to recommend pressures. Michelin and Goodyear are very helpful and I assume that others will be equally good.

PS What make, size, and type (model) of tyres are fitted?

Posted on 26/11/2020 16:53 by LLM

Don't experiment, that could be dangerous.  Put your van into travelling trim, i.e. with everything you would normally carry including passenger(s), about 90% fuel and your normal amount of fresh water.  Get it weighed, total and both axles.  Armed with that info ask your tyre manufacturer to recommend pressures. Michelin and Goodyear are very helpful and I assume that others will be equally good.

PS What make, size, and type (model) of tyres are fitted?

Posted on 26/11/2020 18:02 by SeasideBill

Sound advice. Advice should only be offered by people with a good working knowledge of what they’re talking about.