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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > Tire Pressures



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      09-16-2012, 02:39 PM   #1
cfabluenose
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Tire Pressures

My non RFT tires are wearing a bit quickly on the edges of the tires. Would it help reduce the wear to increase the pressures a bit? The car is a 328i without sports suspension but has 225/45-17 tires on it front and rear. I'm running the tires at the pressures recommended in the manual. Thanks.
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      09-16-2012, 08:47 PM   #2
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Quote:
Originally Posted by cfabluenose View Post
My non RFT tires are wearing a bit quickly on the edges of the tires. Would it help reduce the wear to increase the pressures a bit? The car is a 328i without sports suspension but has 225/45-17 tires on it front and rear. I'm running the tires at the pressures recommended in the manual. Thanks.
It'd be easier to tell from a picture of exactly what kind of wear is on the edges of the tire. Both sides or just one side?

Generally speaking, stick with the recommended pressure listed on the door jam/manual. Nothing wrong with inflating the tires a bit, but keep in mind too much and you'll have excessive wear in the center of tread due to over-inflation.
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      09-16-2012, 08:52 PM   #3
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Stock pressures are normally made low for comfort, so it doesn't hurt to add a couple of PSI. However if you do a lot of city driving the front tyres seem to wear most on the outside edge which is hard to avoid.
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      09-17-2012, 01:01 AM   #4
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I run my non-RFTs about +3 or +4 psi above the recommended pressures. Although, the 2006 manual has very low recommended pressures (29/32) for my car. I think BMW revised their recommendation up in subsequent years as the later e90 owners manuals have higher recommended pressures (somewhere in the 32-35 range).

Also, keep an eye on pressures as the temps go down. You get about 1psi change per 10F temp fluctuation (up or down respectively).

If you post more details about the nature of the wear, we can help you better.
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      09-17-2012, 10:25 PM   #5
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Quote:
Originally Posted by asus389 View Post
I run my non-RFTs about +3 or +4 psi above the recommended pressures. Although, the 2006 manual has very low recommended pressures (29/32) for my car. I think BMW revised their recommendation up in subsequent years as the later e90 owners manuals have higher recommended pressures (somewhere in the 32-35 range).

Also, keep an eye on pressures as the temps go down. You get about 1psi change per 10F temp fluctuation (up or down respectively).

If you post more details about the nature of the wear, we can help you better.
Thanks. I'll post a picture of the tires.
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      09-18-2012, 12:22 PM   #6
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Quote:
Originally Posted by asus389 View Post
I run my non-RFTs about +3 or +4 psi above the recommended pressures. Although, the 2006 manual has very low recommended pressures (29/32) for my car. I think BMW revised their recommendation up in subsequent years as the later e90 owners manuals have higher recommended pressures (somewhere in the 32-35 range).

Also, keep an eye on pressures as the temps go down. You get about 1psi change per 10F temp fluctuation (up or down respectively).

If you post more details about the nature of the wear, we can help you better.
+1

All very accurate information. As others have said, if you do mostly in town or lower average speed stop and go driving, the edges of your front tires will wear faster from turning.
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