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 / 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 (age 10-12)
Junior II Stock (age 13-17)
Junior F-440 (age 14-17)
Junior I F-500 (age 10-13)
Junior II F-500 (age 14-17)
Junior I Sprint (age 12-14)
Junior II Sprint (age 14-17)
Junior F-III (age 14-17)

Youth Classes

Semi Pro 206 (age 7-13)
Pro 206 (age 7-13)
200 Stock (age 6-16)
200 Improved (age 7-16)