it isen`t actualy the wheel size, that is the biggest issue, but the wheel weight...

if you change the wheels to let`s say OZ superlegera, and uoy have got compomotive MO`s on, then u can gain 1/2 a second to 100 easely...

Theese time`s are proved on an g-tech with an averege of 10 launche`s

235/40-17 MO`s

245/30-19 superlegera