20" tyre pressure?

[Pimpster]

Hello all,

I have 20" Alpina wheels on my E65 7 series. And just wanted to know what the tyre pressure should be set at? As they are not standard on this car, the manual is no help.

Thanks!

[535d]

With wheels that big i believe pressures are generally set different winter and summer and also the sort of driving you do comes into it.
I would be tempted to shove 32/36 psi in f/r and see how it feels.

[Darth Dave]

Phone a tyre specialist or the place you got the tyres from. They should be able to give you the correct PSI.

[535d]

There isn't such a thing as a 'correct' psi though.

Too many 'depends' with wheels that big. I asked a guy last night who has 20s on his XKR and he uses 3 different settings at different times for the best results.

[Darth Dave]

535d said:

There isn't such a thing as a 'correct' psi though.

Oh, I do so humbly appologise. Perhaps 'recommended' would be a better word to have used?

[535d]

You're totally missing the point still.

The odds are that the place who sold the tyres won't have a clue!

It all depends what car the tyres are going on, how wide the wheels are are, what sort of driving you're doing, etc., especially as they are presumably a non-standard fitment at 20" in diameter.
My friend sells high performance car tyres for a living and he told me ages ago that pressures are largely a personal thing and will always be a compromise. Getting a figure from a tyre shop is like plucking a number out of the air.
Experimenting is the way to get the 'right' pressures.