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> Tyre Pressures, Cross-plies v Radials
Fred Oldham
post 16 Jan 2015, 16:02
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According to the Worshop Manual for my A90 the standard tyres are 6.40 x 15 and run at 25 psi front and rear. The car is now shod with radial tyres, but I have no information on the correct pressures. I have been inflating them to 35 psi but I am wondering if this is too high. Any offers?
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wolseley16/60aut...
post 16 Jan 2015, 23:18
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35 PSI all round is OK for high speed driving or carrying a heavy load [ Back tyres only ] , whereas 30 PSI [Back tyres ] 28 PSI [Front tyres ] is OK for 'normal' driving.....
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Danny
post 16 Jan 2015, 23:54
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I would say that experimenting between 32-35 would be the go for something the weight of the Westminster. Obviously depends on the actual size and brand of the tyre though.

Danny
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Fred Oldham
post 19 Jan 2015, 15:54
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Thanks for the replies people. Based on them I think i give 30 front, 32 rear a try and see how that feels. As for 'high speed' driving, I suppose that's a matter of interpretation. I doubt that I will top 60 mph very often until I get to know the car and it's behaviour a lot better.
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MYKE
post 19 Jan 2015, 17:10
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Paint a stripe across the tread and take the car for a short drive. You can tell by where the paint wears whether you need more or less pressure. Too much will wear the centre of the tread first, and too little will wear the outside.

MYKE.
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Llansadwrn
post 19 Jan 2015, 20:17
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Years ago I took my GMC pickup, which has dual rear wheels, in for a new set of tyres (six tyres = an expensive day). I bought them from a local garage, and the garage manager told me very seriously that on duallys (as they are called, and pronounced DOO-lees) they would set the inner rear tyre pressure at exactly 3 psi less than the outers, because the road tends to be crowned (IMG:style_emoticons/default/smile.gif) I nodded and whistled and I hope looked suitably impressed. When I got the truck home I checked the tyre pressures and found that they were totally random between about 45 psi and 70 psi, Some communication error with staff presumably.
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