On the seat rule.If your running 16" rear tires you can cut out and drop seat down to 13 inches from ground ,so seat pan would be lower than tops of tires?
Yes, here is the rule:
* Seat pan area may be modified to allow seat lowering. Seat bottom will be no lower than 13” from the
ground. This means seat cutouts are permitted but the area must be closed in so there is no sharp or
protruding areas what so ever!!!
also there are some nice color pics in the rule book...