Why does the car weigh more in the Roadcourse configuration than for Ovals?
Much of the weight difference comes from the larger Roadcourse brakes and suspension uprights. The brake rotors are thicker to manage the greater heat build-up on the roadcourses. There are cooling air ducts on all four brake assemblies for Roadcourses which are unnecessary and removed for the Ovals. The ducts are carbon fiber, so, functionally important for the Roadcourse, are insignificant weight-wise. The Roadcourse differential is heavier than the Oval spool rear-end.
