The harsh ride goes away with non RFT. I run the vredrestein SUV Sessanta tires, and the ride quality is way better than with the RFT. Also, by running a lightweight forged wheel, you offset the increase in unsprung weight when you go to a 20" size wheel.

I carry the BMW mobility kit in the trunk. Its similar to what came with my E46 M3, and I do not want to have to replace run flat tires everytime I get a flat.

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