Stevenwr

I have a 1988 s4 and just put on 10 spoke Panamera wheels.....235/40 front and 265/35 rear. I'm wondering what tire pressure I should be running the tires at ? Seeing as the tires are lower profile I'm thinking the pressures should be a little higher than stock tires (44 psi rear and 36 psi front).

SwedeInSiam

I use 2.5 Bar (36 psi) in all 4. Works for me.

Stevenwr

Ok thanks. I'll try going with the stock tire pressure.

The Forgotten On

I'm going with the stock pressure in both of mine and it has been perfect.

FredR

In the days long since gone when I used the stock 16 inch wheels I reckoned that the only valid reason to run 44 psig in the rears was to stop the RDK alarm from going off. I felt it was way too high and the wear pattern said so as well given they used to wear faster in the middle.

Presumably your new wheels are 18 inch and yes the profile is lower but that means they have stiffer side walls and that should reduce the need for pressure slightly. Add to that you also have wider sections that also reduces the need for pressure so you should try what Anders suggested or even a tad lower.

Remember as the tires heat up the pressure increases by about 2 psi there or thereabouts.

If you really want some fun look up the weight loading and the rated pressure for the rubber you are using and pro rate that to the 400kg per corner weight- that will probably give you a number of about 26 to 28 psig [hot]. Every car maker and tyre manufacturer knows that air migrates through tyre walls and owners do well if they check their pressures every two weeks. When recommending tyre pressures I reckon they take such loss into consideration and thus assume an operating window about 5 psi wide. Lewis Hamilton might be able to tell the difference but most drivers would never notice such difference or so I suspect. I was advised by the Middle East technical representative for a major tyre manufacturer that if you do that calculation running your tyres down to that calculated pressure will not cause them any harm and you get a slightly more comfortable ride and in some circumstances better handling. Not sure I would want to do that on a high speed run but at lower speeds on our autocross competition I tried it and went faster immediately.

Thus why it is not a one size fits all!

Keith Coe

I run 36 front and 40 rear. I have the 5 spoke Panameras. 36 in the rear just doesn't stiffen the sidewall enough for me when cornering.

Bertrand Daoust

Carrera III, 235/40-18 front and 265/35-18 rear, Michelin Pilot Super Sport.
32 lb front and rear. Cold.

Stock pressure is way to high for me.

NoVector

OP: What kind of tires do you have? I have the 10-spokes and Hankook V12s evo 2s. I keep them at 36 psi all around and tread wear (front and back) is even across the tire.

Stevenwr

For tires I’m using Continental DWS-06

Michael Benno

There was a useful thread a while ago the described the method to calculate the the appropriate tire pressure for various tires and sizes for a given vehicle using load index tables. I remember I followed the instructions and it was fairly mind bending but I did do the calculations for the 18" tires (Michelin Pilot super sport) on my car. I made this little sticker to help me remember the pressures. Maybe this would be helpful for you.