I would like to put new wheels on my GTP but keep the factory ratio or rev/mile my question is what have you ( anybody who can help ) been putting on your Pontiacs. When I went to http://www.miata.net/garage/tirecalc.html
to compare the ratios of the overall sizes the two tires that are almost perfect are 245/50-17 and 245/45-18 but from grandprixstore.com I heard that those are not that common so 255/50-17 and 255/45-18 should be what I should look at.
Has anyone had those or larger sizes rub agains the wheel wells. What are someof the sizes YOU have.
Thanks