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Old 08-06-2010, 09:21 AM
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Default Recommended tire pressure for 20" S8 wheels/tires?

I put some S8 wheels on my A8 but I don't know what pressure I should use because I don't have the S8 manual. Anyone know the correct pressure?
Thanks!
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Old 08-07-2010, 11:42 PM
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Doesn't matter really, whatever the door says is what you should use. Tire pressure is based on vehicle weight, not the tire. Most tires can handle 60+ psi, but no one is about to crank it up that high.
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Old 08-08-2010, 10:20 AM
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I have 2 sets of wheels for my A8...17 & 18"...the label on the inside of the gas lid (like on your 2000, I assume) says 30lbs for 17" and 32lbs for 18". My last Porsche had similar recommended differences.

I would NOT assume a rule of 2 extra pounds for each extra inch of rim though. Different aspect ratio and width combinations determine how a tire "spreads" on the road under the same weight...not the rim diameter.
In racing and serious exotics circles, they often decide perfect pressure with a pyrometer (tire thermometer)...uniform temperature across the whole tread section after a calm straight road drive, without hard acceleration. Hotter in the middle = too much pressure...Cooler in the middle = too little.

So, I would try to contact someone with an S8 model that offered the 20" option (same aspect ratio/width)...or a dealer. They might even have one on the lot.

Last edited by silverd2; 08-08-2010 at 01:32 PM.
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Old 08-08-2010, 03:36 PM
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My book says says this:
255/40 R19 AllSeason Front-36 Rear-38
255/40 R19 HighPerformance Front -33 Rear -35
275/35 R19 HighPerformance Front - 33 Rear - 36

I have 265/35ZR -20.

Guess I gotta call the dealer. I hope their in a good mood this time....
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Old 08-08-2010, 03:58 PM
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Yep, depending on your normal load too.
I've always gotten good even tire wear, goin with the Audi label's small load suggestion...front and rear the same. I rarely ever carry much more than 1 passenger and a set of golf clubs.
Don't know what they recommend for 20's and load size, though.
Old 08-08-2010, 03:58 PM
 
 
 
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20, a3, a8, audi, correct, inch, maximum, model, pressure, proper, recommended, s8, tire, tires, wheel, wheels


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