Would appreciate feedback on these two tires. Also, would like to go to 255/40/17 and 285/35/18. Has anyone gone this route, will these tires fit stock C5 rims - I know the tire height is different from stock, but will this be an issue (especially rears)???
This should help you decide tire sizedifferences. Put your original and optional sizes in. It will show you actual profile and diameter, also the comparative heights. It will show you speedo differences too.
FYI...I have Pilot Sports, fronts are 275/30/19 rear 295/35/19 rear. The diameters are within 1/4inch of stock, no problems with active handling. I have about 5k on them and so far they have been great.