Interactive wheel and tire combination calculator. As an example, here is a side by side comparison of my 17x8 RH AD Cups and my soon to be shod 17x7 Porsche 993 Cup IIs: The Cup IIs shod with 205/50s are actually 4mm larger in profile, but .8"(20mm) narrower in tread width. But in weight is where is gets interesting: Typically 4 pounds lighter rotational mass. Zippy and sticky. Have fun with your wheel specs. ;) :wrench: