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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 07-24-2015, 10:49 AM   #1
Aralph30
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Join Date: Jul 2014
Location: New York
Posts: 6
My Ride: 325xi
What should my tire pressure be?

I have a 04 325xi. I recently replaced my oem 16s with replica 135s That are 18s. I used to just have the tire pressure at 32 for all four wheels. But now with these new one I have no idea. The fronts are 225/35/18 and the rears are 255/35/18. if anyone can help me with this that would be great.


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Old 07-25-2015, 11:05 AM   #2
White_Knuckles
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Join Date: May 2009
Location: Washington (the state)
Posts: 1,658
My Ride: 2003 325xi
Well some may direct you to the driver door jam sticker which well defines PSI for different tire sizes and loads. Front to rear pressures differ by 3-5 lbs in all breakouts. I'm not sure 18's are listed but you can look? I really chimed in because my son works for a major tire shop and I questioned him what the shop policy was on new mounts they warranty. His answer was 35 lbs all around. Seems tire manufacturers list a range of pressure the tire will support often going up to 50 lbs. The optimal recommended pressure simply averages as 35 for most passenger tire makes. The front/rear variable is not common with most cars. My kid suggests keeping 35 all around and checking it every couple months is best practice as the small difference (with spec) is not really affecting handling or tire wear. He points out most cars rolling in vary several pounds all around where most are under inflated from not checking them.

A proper gauge is a must for me. Stick gauges are junk as well $10 dial gauges. An accurate dial gauge is a one time purchase and will give you better results at 35 lbs all around than a $3.00 stick gauge used at factory specs. Actual pressure on a stick gauge will often read 2-4 pounds off from what you need.

Edit: I think your question was concerning the wider rears needing more or something? The pressure is the same where the volume of air changes with sizes.
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Last edited by White_Knuckles; 07-25-2015 at 11:14 AM.
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Old 07-25-2015, 11:11 AM   #3
Aralph30
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Join Date: Jul 2014
Location: New York
Posts: 6
My Ride: 325xi
Okay thanks for the response. I'm gonna check the door jam. But probably just use your advice. Thanks again
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