I was considering going w/ 18x7.5 Rota Subzeros instead of the planned GT3 16x7s. 18" Subzeros weigh in at about the same as the stock SH wheel and I was concerned about how the additional rotational mass on the outer edge of the wheel would slow down the actual rotation of the hub which I believe the system gets it readings from. Would'nt that slow down the response time of the system since it "sees" the hub spin slower than it normally would on a 16" wheel in a spirited turn? I just want to make sure I rule out any problems before considering anything larger than the stock size.