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Martin - are you not going by what it states on the tyre sidewalls?
 

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mac1967 said:
lol...Good point John...

Alas, I just looked and it only states the pressures for 17s and 18s.

Regards,

Martin :)
Ah, well generally the same pressure for the same weight and width of tyre as the same contact patch area x psi = supported weight. You might want to wary it a little upwards as lower profile may have less flex in the sidewall and suffer from a lower load rating. But it depends on the tyre. They are also more difficult to spot when underinflated.

One trick is to paint a line of Tipp-Ex across the tyre tread and see if the line wears off evenly. If it wears at the edges first pump it up a little. If it wears in the centre let it down a little.
 

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Tyre pressure stated on the tyre wall is maximum i think , and you dont want to go there , i was running 29lb's in my 235/35/19's
Dean at 4rings when i was having the car serviced around WAK's said go to about 31 to 32 as he has noticed the amount of cars he is servicing including mine were showing wear with under pressure tyres so increased it a little and i must say , the steering felt a lot better for it . Its only an extra 3lbs and made that difference.
 

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36 front and 30 rear seems to be the form here, but I run 38 all round - it just suits me better... :wink:
 
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