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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 > Non-runflat Tire Pressures--What are you running?



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      09-14-2010, 08:06 PM   #1
vantage_coupe
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Arrow Non-runflat Tire Pressures--What are you running?

I'm running non-runflat performance summers on my 335i coupe now and feel like my turn-in has suffered (almost a little sloppy now).

The tire shop set me up with 32fronts 35 rears and I was wondering what you guys are running as I'm unsure what to run them at?

Tires are 265/30/19rears and 235/35/19 fronts
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      09-14-2010, 10:10 PM   #2
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36/38 will give you a big improvement
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      09-14-2010, 10:44 PM   #3
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will this also apply to 235/40/18--265/35/18 ?
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      09-15-2010, 12:21 AM   #4
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Quote:
Originally Posted by ska325xi View Post
will this also apply to 235/40/18--265/35/18 ?
Yes.
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      09-15-2010, 07:22 AM   #5
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I am running RFT 225/35/19 Front and 255/30/19 rear

My rear tires have worn inside due to the 2 1/2 degree chamber on my car during a extended road trip. I am told wear is normal on my Z4 due to retractable roof in trunk and some luggage.

Both the tire shop and BMW recommends I run the rear tire 10% above specified air pressure (as listed in door well). I am doing this.

Also, I notice that I loose a few PSI every week, so every Monday morning I check and adjust my air pressure. I keep a good air compressor (with gauge mounted on the compressor in my garage).
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      09-16-2010, 06:05 PM   #6
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curious to this as well. going 225/35/19 and 265/30/19
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      09-18-2010, 03:33 PM   #7
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Just read a tire rack article. Apparently unless you're going to be driving hard (autocross/rally etc) it's not worth it to over-inflate due to poor wear/easier for tire to be damaged on potholes etc.

Guess I'll be trying out the reccom pressure above to see how it does
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      09-18-2010, 04:09 PM   #8
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Quote:
Originally Posted by vantage_coupe View Post
Just read a tire rack article. Apparently unless you're going to be driving hard (autocross/rally etc) it's not worth it to over-inflate due to poor wear/easier for tire to be damaged on potholes etc.

Guess I'll be trying out the reccom pressure above to see how it does
My rear tires have worn on the inside. People in the tire business (one of the major US tire shop chains) told me the inside wear is due to the extra weight of the roof in the trunk and luggage (I was on a vacation trip at the time). The tire shop manager recommended I run the rear tires 4 yo 5 psi above spec.

Later when I was back home my BMW service manager recommended 10% above specified pressure to take advantage of the good tread.

I check tire pressure every week (Monday mornings at fairly same temperature in my garage), I note there is some pressure loss I have to add 3 to 5 psi every week to maintain required tire pressure. I never had to do this before RFT, I will do the checks as long as I run the RFT.
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