Quote Originally Posted by erlrich View Post
Yeah, but there are still a limited number of ratios available for most cars. Having the option to run a shorter tire might give some guys a final ratio they might not otherwise have available. I don't think this will be an advantage to any one car over another, but I do see it giving some cars options they might not otherwise have had.
Given the minutia being discussed on motor mount matters apparently, this comes across as a pretty big horse to let out of the barn. A 225/45-13 has in round numbers a circumference, and resulting shorter gearing 10% less than a 225/45-15. It's not the the little wheeled cars going up in size, but the big wheels going down.