I am running 205/40 x 17 wheels and am wondering what tyre pressure others are using for the road.

[Edited on 21/5/10 by skibikejohn]

I think you mean Tyre pressure?

Sorry, couldn't resist it

I know they're not the same but I've got 205/55/R15s, ~600kg weight with driver, and my tyres are around 16psi.

It's pretty simple to roughly work out a good starting point: Total weight(lbs) / 4 / tyre contact patch (square inches). So mine is ~600kg = 1320lbs. 1320/4 = 330lbs/corner (assuming 50/50 weight distribution!)
I parked my tyres on a clean sheet of A4 and measured the approximate contact patch - around 5" x 4". 330lbs/20sqin = 16.5psi.

Or.... start with around 15-18psi and adjust to suit your car and your driving

Ed.

205/40/17 - depending on tyre sidewall stiffness - try 17psi +/- 2psi

Thanks for the help.

Sorry mate, didn't mean to correct you. We Brits are always doing it,

You say Tire, we say Tyre lol! Hope I didn't offend

Daddylonglegs

Not a problem. I'm an Aussie living in Canada so, although I may spell badly, I am used to taking the mikey. But we can still beat you in cricket

quote:

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Originally posted by skibikejohn

But we can still beat you in cricket

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