I want to upgrade my stock c5 alloy wheels to chrome c5 wheels, I have the Goodyear runflats on the car. I was told a couple different things about the runflats. One was that there is a thick rubber band around the rim that must come off after you dismount the tire and then installed on the new rim, the other was that the runflats have a very stiff sidewall and that is what holds up the tire in the case of a flat. Which is right, and is it a problem to change the rims with the runflats. Thanks so much for your help.