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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Wed, Dec-03-2008, 04:58:24 AM   #1
wally828
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Default Tire Pressure

I just put 245/35-19's (front) and 275/30-19's (rear) on my car, and I'm wondering what the ideal air pressure would be for the tires. I got them mounted/balanced/installed somewhere, and the guy told me that he inflated the tires to the specifications of what the car calls for inside the door jam. Being that I have different size tires (and now different size wheels since I went from factory 18's to factory 19's), would this air pressure rating now change? The guy said it stays the same no matter what wheels and tires you put on, which I find hard to believe since all tires are different sizes. Any help here?
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Old Wed, Dec-03-2008, 05:02:53 AM   #2
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check the door jam... it tells you what to run for tire pressures. different size doesn't matter... its PSI (pounds per square inch)
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Old Wed, Dec-03-2008, 05:09:23 AM   #3
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The only pressures the door jam on my 05 shows are the super high (41/48 IIRC) pressures for a fully loaded car with weight in the trunk, not for normal 1-2 passenger driving. Those are much lower. Don't go by the door jam. Look in your manual.
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Old Wed, Dec-03-2008, 05:11:51 AM   #4
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so you're saying whether I have 18's, 16's, or 19's on my car, the air pressure is still going to be what BMW calls for? I just feel like there's different amounts of air that could go into a tire due to it's size/area.
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Old Wed, Dec-03-2008, 06:05:37 AM   #5
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Quote:
Originally Posted by Archimedio View Post
The only pressures the door jam on my 05 shows are the super high (41/48 IIRC) pressures for a fully loaded car with weight in the trunk, not for normal 1-2 passenger driving. Those are much lower. Don't go by the door jam. Look in your manual.
Oh sorry, i've personally never checked the door jam... i just knew that had some of that info there... i guess that is for the fully burdened vehicle. Then yes, owners manual.

And yes, unless you are deviating far away from the OE sizes i would run the recommendation in the manual.
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Old Wed, Dec-03-2008, 06:42:57 AM   #6
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On your tires it will say max PSI. Do not set it to that. More than likely its like 50-55 or so PSI max. I would go with something in the low 40s.
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Old Wed, Dec-03-2008, 06:46:19 AM   #7
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Quote:
Originally Posted by zemperaye View Post
On your tires it will say max PSI. Do not set it to that. More than likely its like 50-55 or so PSI max. I would go with something in the low 40s.
I usually do 36 / 38.
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Old Wed, Dec-03-2008, 01:38:07 PM   #8
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Quote:
Originally Posted by zemperaye View Post
On your tires it will say max PSI. Do not set it to that. More than likely its like 50-55 or so PSI max. I would go with something in the low 40s.
Wow...

That must be a joke.
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Old Wed, Dec-03-2008, 02:34:46 PM   #9
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I don't have my car handy, but I believe the door sill (jamb, whatever) has 33f/38r recommended pressure for the ZCP (225/255). I'll check the car when I get back to the train station tonight.

I asked Continental about the appropriate pressure when moving up to a 245/275 from stock. Their response:
Quote:
I have received correspondence from our product engineer and here is his response:

The best answer we can give is to try to match the load carrying capacities. If we do that, then there is no change in load carrying capacities between the sets - and therefore no change in inflation pressure.

Sincerely,

Continental Tire North America Inc.
Customer Relations
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Old Wed, Dec-03-2008, 05:22:36 PM   #10
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for the most part, psi is personal preference. I run 42F/40R on 245/275's. As long as you're somewhere between the door jam #'s ans the max psi, you should be fine.
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Discussing Tire Pressure in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)