The whole idea of building a car amd customizing it is to do it how YOU want. If people can't run larger wheels on custom cars that they race also, then everybody also needs to snatch out their interiors, glass, metal body panels, etc if they want to race, why stop at limiting the wheels? I know guys who pull jetskis to the beach with their cars on 26s, and then drive out to the track and run. Who cares how big of a wheel somebody wants on their car?