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Old 9th June 2010, 18:38   #1
hisport
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Tire Pressure?

What tire pressures work best for everyday normal driving?


- The door jamb sticker has everything; from 34 F and 38 R to 44 F and 48 R

- The owners manual says nothing (but takes 5 pages doing it)

- Related threads on this forum are mostly tire brand opinions (and alot of 'em)

- I have stock wheels and Bridgestone Pole Position RE960AS tires (if it matters) 245 40 18 front and 275 35 18 rear
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Old 9th June 2010, 18:56   #2
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I've been doing 33/36 front/rear when cold which comes out to about 38/41 front/rear when hot.
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Old 9th June 2010, 19:37   #3
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My '01 has door jamb cold pressures of 39-F, 46-R.

Does anybody know why would different M5 cars of the same family would have different pressures listed?
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Old 9th June 2010, 19:50   #4
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Door specs provide a range based on vehicle load. Front vs rear PSI bias can depend on your wheel setup, driving style, suspension setup. Different tire makes have varying stiffnesses, which beg for different PSI. Some drivers prefer to trade tire longevity for traction/comfort, and shade PSI lower.

The best answer is to get a tire depth gauge, monitor your tires for center and outer wear over time, and adjust PSI accordingly. This presumes you are also monitoring balance and alignment, since both can skew your tire wear observations.
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Old 9th June 2010, 20:37   #5
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Yeah, I understand why people would use different pressures. I just don't understand why the factory would apparently put different PSI numbers on cars that were essentially identical?
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Old 9th June 2010, 21:41   #6
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The Owner's Manual does appear to provide the recommended tire pressure. The recommended tire pressure is shown on Page 23 of the online 03 manual. The variation is for load (standard size), minimum for four passengers with maximum for either five passengers/four passengers plus luggage.

Quote:
Originally Posted by bwilly View Post
My '01 has door jamb cold pressures of 39-F, 46-R.

Does anybody know why would different M5 cars of the same family would have different pressures listed?
Based on the info provided in the manual, it appears you have the wrong sticker on your door jam. The suggested pressure of 39/46 is as indicated for the 245/45/17 tires on the standard 5.
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Old 9th June 2010, 22:49   #7
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I believe door jamb sticker lists MAX allowable pressure.
I usually do 34F/36R.
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Old 9th June 2010, 23:22   #8
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The max allowable pressure is listed on the tire itself.

Because of the drastic camber on the rear of these vehicles, checking inner to outer wear is sorta pointless.

I was once told that you go by the door pressure and they a 1-2 psi for every inch larger wheel you go, so if you have 19's your would ad 1-2 psi to the 34/38 or whatever.

Anyone else heard this?
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Old 10th June 2010, 05:43   #9
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Running a square setup, I opt for 35-36# cold which is right around 40# when hot.
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Old 10th June 2010, 06:27   #10
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live in florida so it's pretty much always hot. 37/42
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