Racers & Teams > Rules & Classes

Rules & Classes

The USSA PROSTAR Series races under ISR (International Snowmobile Racing) rules. These rules focus on safety, fairness, and even competition. Please click the link below to read them for yourself and/or download a copy.

If you have any questions on the rules, please jump over to our contact page and email us.

Oval Classes

F-440 Fan
F-500
F-500 / Sportsman 600

F-500 Women
F-500 Sport
Sportsman 600

Pro Formula III
Pro Outlaw
Pro Lite
Pro Champ 440 

Junior Classes

Junior I Stock
Junior II Stock
Junior I F-500
Junior II F-500
Junior I Sprint
Junior II Sprint

Youth Classes

Semi Pro 206
Pro 206
200 Stock
200 Improved