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Originally Posted by chris7676
I'm not looking for lap times or ultimate grip - that's why. I'm sure you can fit a 225 on 8.5 rim - Porsche even states this for the winter tyres and people on here have fitted a 225 on the 7 rim although for the fronts. But which is better rim witdth for the tyres ?
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You will need to check the specs for the exact tire you plan to run. For Dunlop Z1 Star Spec the ideal rim is 7.5 with a possible range of 7-8.5. Wider rims give you more sidewall stability, narrower rims give you less unsprung weight. Every choice is a compromise depending on your desired outcome.
http://www.tirerack.com/tires/tiretech/tirespecskey.jsp#measrimwidth
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
Last edited by Topless; 07-22-2010 at 07:17 AM.
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Lil Red
2009 Porsche Cayman 2.9L
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