Thanks for all the comments. If the overall diameter/width is the same i.e Toyo proxes 205/35/18. and the wheel is lighter i.e OZ ultraleggera, how can the handling/acceleration change? I need to check out the brake caliper situation! But I think LCR wheels would solve this. Does anybody know the width of an LCR wheel 7, 7.5 or 8j? thanks again