OK, so like you want bigger wheels, you have to find a car that has bigger wheels. There is no set size, you just barrow them off of other cars. And then you have to make sure they fit, because a tire going through a wheel well looks bad. And some cars have bigger tires, and some have lower profile tires. The Stratos tires are thick, like rally tires, and the Miata LS are super thin, you just have to have a general idea of tire size and what fits.