Originally Posted by MikeXray

They changed what used to be open 17.5 classes (or slowest classes) to sportsman, where the driver can not be sponsored in any way, can't wear logo clothing, or have sponsor stickers on their cars. If you run in a sportsman class, you can't run in the same expert class either, like 17.5 and 13.5 rubber tire. I am pretty sure you can run expert when there is no sportsman offered, like 13.5 WGT.