[jbh]

I'm back in a Z4M again, a black roadster this time. Picked it up last month. I was planning to run kosei k1 wheels with 255/40-17 re71r tires for autocross. Any other options on lightweight wheels that are close to that price? I could also run 18 inch wheels but tire and wheel price rises dramatically. Only other thing I plan to do is alignment and install my turner shim kit. Will still daily drive on stock wheels and tires.

Any idea what this smaller wheel will do to my top speed in second gear at deadline? Maybe 66mph with 18's and 62mph with 17's? I see that as the main disadvantage of a smaller wheel.

Thanks