Haha, actually that's what I was told, the Cup car takes curbs much better than the street car i.e. GT3RS because of the smaller wheel size. 

The 18" slicks on the Cup car have a very forgiving sidewall, the 20/21 combo in the GT3RS not so much. They bent quite a number of rims at Leipzig from people taking the curbing at Bus Stop while braking, adding load to the front wheels.


--