2002 Grand Am GT Stock is 225/50/16 Bought from the dealer with XGT H4s on the front, and I think there's Pilot Sports on the back. However, those tires are 225/55/16, slightly taller than stock. I have no idea if the speedo and odometer were readjusted for these sizes. Frankly I really don't care either, since using a calculator I found in another post, at 75mph there's less than 3mph difference, and I'm not concerned about the accuracy of the odometer either. I was thinking of staying with the 55 sidewalls, simply because there's more of a tire selection there, and I'm assuming the taller sidewalls give a better ride. When these tires (which still look very new) finally go down, I'm planning on replacing them with Yoko Avid V4Ses, which are rated really high on tirerack and the high performance all season category coupled with the nice price really attract me to them. Opinions? Stick with the slightly larger size?