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Old 18th October 2007, 00:07   #1
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Default optimum tyre pressure on upgrades

Most cars have a placard showing recommended tyre pressure on the tyres the car came with as OE.
What happens when you upgrade? I cannot find any guidance.
In my case I had 165/80R13 on the Baleno, tyre pressure recommended was 29 psi. Now I upgraded to 185/70 r13. Should I maintain the same 29 psi?

Is there any formula to calculate the new pressure, based, say on the increase air volume after upgrade?

The Car Tyre Bible (sorry don't know how to post the link) suggest you can go upto 10% below the max recommended pressure printed on the side of the tyre. In my case the Michelins have 44 psi printed as max pressure. Does this mean I can go up to 44 - 4.4 = 39.6 psi?
Expert opinions please!
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