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      12-13-2015, 11:12 AM   #18
BMW335iOn18s
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Drives: F82 CS SMB
Join Date: Jul 2007
Location: Philadelphia, PA

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Quote:
Originally Posted by krhodes1 View Post
I doubt you will find a 3-series on RFTs to be an improvement. My '11 on 17" OEM Continental RFTs rides worse than my M235i on non-RFT Pilot Sports. And RFTs are MUCH worse for bending wheels than non-RFT. With nearly no give in the sidewalls, the force of an impact has to go somewhere - right to the rim of the wheel.

My suggestion would be to get a set of 17" wheels with non-RFT tires. The taller sidewalls will help a great deal. Much cheaper than replacing the car.
I don't have RFT's on my M235i, but the 328xi F30 loaner i had, and my mothers 528i non sport both have run flats, and they're WAY more capable of handling potholes than my car. I hit an insanely large pothole going 25 MPH before the holland tunnel in the 528i and it didn't even bubble. That same impact in the 640i or my car would have bent the wheel, slashed the tire at MINIMUM. Run flats might feel stiff, but you can't compare 225/55/17 to 245/35/18....one has 3 times the sidewall of the other.

But yeah, we always replace run flats with DWS, except for the most recent f10 we've had (barely put 8k on it in one year) and my car (apparently winter was cancelled this year). All they do on the previous e92s we've had and the 640 is bubble/absorb the impact without transferring it to the wheel so you don't bend the wheel. You still have to wait for a tow truck though.
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Current: '20 F82 M4cs SMB / '13 640i M-Sport Carbon Black
Past: F30 330xi Luxury Line / F22 M235i 6MT / E92 335i / E46 330ci / E36 328i 5MT
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