tyre pressure (1 Viewer)

[Hayleylulu]

just found out iv been putting the wrong pressure in my tyres on the in side of the door it says 43psi put iv found in the book that came with van that says front 59psi and back 65psi for my Peugeot boxer wayfarer is the one on the door right or the one in the book

 

[pappajohn]

think id go by the book......the one on the door will be for a standard panel van. ie: white van man.

if its a bit of a hard, bumpy ride then reduce it a bit but 43psi sounds too low to me.

my kontiki takes 65psi rear and 61psi front and feels about right.

 

[pappajohn]

there is a tyre pressure calculator in downloads but its a bit complcated to use.
you need your tyre type and size and axle weights.


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[shifter]

hya pap
mitchelin recomendid 65psi rear 60psi front for 215/75/r16c for my swift kontiki 645.the sticker on the door says 80psi front and rear.

IAN.

 

[pappajohn]

hya pap
mitchelin recomendid 65psi rear 60psi front for 215/75/r16c for my swift kontiki 645.the sticker on the door says 80psi front and rear.

IAN.

thats the absolute maximum pressure the tyre can withstand.
you wouldnt want be running at that.....shake your fillings out...

 

[scotsy]

michelins reply

My (new to me) Hymer felt hard over the bumps and I found the tyres were inflated to the handbook reccomendation of 70psi (5 bar) . After reading a post on another site i sent Michelin an email about what pressures i SHOULD be using...

"Please could you advise me the correct 'cold' tyre pressure for use with my year 2000 (Fiat Ducato 2.8JTD based) Hymer B584 motorhome. Its MGVW is 3400kg, max front axle 1650kg, max rear axle 1750kg and is fitted with Michelin 215/70R15C (109q) tyres. Current pressures are 70psi and ride feels quite harsh. thankyou Ian"

Please bear in mind that it depends on YOUR tyres and weights but this was their reply:-

"Dear Mr Scotson

Thank you for your recent e-mail.

We suggest that individual axle weights from weigh scale readings are used, in order to calculate pressure recommendations for each quoted load condition. These would be preferred, due to readings being taken in the actual vehicle 'running' condition - that is to say, with all water/fuel/baggage & passengers etc. onboard - and may result in better comfort if the vehicle is running way below maximum capacity.

The results of roadside surveys indicate that some motor homes have been found to be over laden, especially the rear axle, with potential for subsequent tyre related problems.

The overall tyre industry, therefore, tries to build-in a safety factor by fitting strong tyres, inflated to high pressure, in order to remove the potential for consequences of overloading &/or under-inflating the tyres.

The drawback of this safety factor, at the corresponding high pressure, may be an extremely hard ride. The contents of the motor home may rattle, but the tyres will cope nicely.

One 'overall' weight is of no use in calculating tyre inflation pressure levels, since the vehicle may appear to be within the maximum permitted, but in reality may have the rear axle severely over laden & the front axle very lightly laden.

As a guideline from the axle weights that you have supplied and if on the Agilis Camping or XC Camping tyre size 215/70 R15 C 109Q, the pressures for those weights are as follows:-

Front axle load of 1650kg the pressure should be – 55 psi (pounds per square inch)
Rear axle load of 1750kg the pressure should be – 55 psi (pounds per square inch)

The Front axle pressure in this case may be the same as the Rear even though the axle loads are different. Therefore the slight increase in pressure which has been added to the front axle is due to the braking forces and shift in weight that’s being exerted onto it.

We have allocated your message the reference number indicated above. If you need to contact us again regarding your message, we would be grateful if you could include the reference number.

Once again thank you for your interest in Michelin.

Yours sincerely
Michelin Tyre Public Limited Company

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I have since reduced them to 55psi as advised and the ride feels much better now

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