Hey Rob.. I don't know if you have noticed or not, there are two different types of stockcars in the two (Nationwide & Sprint Cup) series. The COT (Sprint Cup) is a top heavy car with a different roll rate in the center balance of the car (cross wedge). This creates a premium on grip in the front end (to be more precise the right front) of the vehicle. The Nationwide series runs the old style car with a lower center of balance which is adjustable in three areas. Goodyear hasn't figured out there are two types of stockcars in these two series either so don't take it personal, ok?