Tyre pressures (1 Viewer)

[Paul an Jane MK]

There is a plate on the inside door frame of our cab saying fronts 72.5 psi and rear 79.5 psi. Got my local garage to order some new tyres like for like as the ones fitted from new although not worn out were past their best.

A bit concerned to see new tyres had max pressure of 70 psi stamped on them so I then looked at the old original tyres fitted at the factory and they are stamped with max 69 psi.

So new tyres higher than old original ones but still some way short of tyre pressures for vehicle.

So what is all that about?

 

[mike mcglynn]

Hi,I think those pressures relate only to the American market as they have to have them under US regs.

 

[two]

Refer to the manufacturer of your tyres, specifying the axle weights of your vehicle. You may be able to run with less than 70psi and get a better ride.

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[Paul an Jane MK]

It does say in small print above "codes USA/Canada only"

Wasn't sure what codes were.

The new tyres are rated just over my axle weight, so have you tried running lower pressures? Always set tyres at vehicle manufacturers recommended pressures

 

[Clarky]

In most vans 72.5 & 79psi will shake your fillings out, particularly on UK roads.
Weigh the van with it loaded for a trip and e-mail the tyre manufacturers with the separate axle weights.
You might be surprised how much lower the pressure could be and how much more comfortable the ride could be.

Richard.

 

[Pausim]

I use the plated tyre pressures given even though they are very high, ride seems ok. Most motorhomes are built near the top end of the weight limit and by the time they are fully loaded are likely to be very close to it so it doesn't surprise me that high pressures are needed.

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[138go]

The vehicle manufacturers work on the fact that the vehicle will be fully loaded and that is therefore the tyre pressure to use. Motorhomes can be lighter than that especially at the front so the best way to sort it out is to take it to a weigh bridge and get it weighed with all your normal bits and pieces along with a full tank of fuel and water if thats what you normally carry. You need the weight for the front and rear axle. It will also show if you are overweight. Once you have this crucial information you can ask the manufacturers for the pressures for the given axle weights. You should also use a decent camper specific tyre which are designed for the higher weights. Our Laika uses 80 psi at the rear because the weight on the rear axle is 2340kg.

 

[DL42846]

Which brand of tires do you have? I run my Michelin's at 72 front and 80 rear which is what Michelin and Fiat recommend. I contacted Michelin with axle weights and they replied I could run the front at 65 psi. I tried it but didn't like the feel of the steering, it felt woolly and harder to turn which made me think that more stress was being placed on the steering ball joints etc. My Van and I feel much more comfortable running at the recommended pressures. My axle weights are 1440 kg on the front and 1880 kg on the rear.