Ontario Snowmobile Oval Racers – OSOR is a non-profit organization regenerating the sport of snowmobile racing and bringing it to communities throughout Ontario. As a group of racers, sponsors, fans and family members devoted to this sport, our collective experience in snowmobile racing spans seven decades.

CLASS DIVISIONS
ANY QUALIFIED MEMBER MAY PARTICIPATE IN THE APPROVED CLASSES OFFERED IN ANY OSOR EVENT PERTAINING TO THEIR AGE GROUP. SNOWMOBILES ARE ALLOWED TO RACE IN THEIR PERSPECTIVE DISPLACEMENT, OR DESIGNATED PERFORMANCE CLASS, AND ANY LARGER DISPLACEMENT OR PERFORMANCE CLASS, EXCEPT AS NOTED IN SPECIFIC SECTIONS.
Atom: 4 to 7 years old Junior 120
Bantam: 8 to 10 years old Junior 120, Junior 200, Junior Mod 206/120
Novice: 10 to 12 years old Junior 120, Junior 200, Junior Mod 206/120, Sports Junior 340
Junior: 13 to 15 years old  Semi Pro F340
Juvenile: 16 to 17 years old Semi Pro F340, Junior F500, Stock Single Fan, Stock Fan 340 & 400, Stock FA 300
Adult: 19 years and older All Classes excluding Junior, Masters and Seniors (unless age qualified)
Masters: 45/F500 50/Mod All classes excluding Junior and Senior Classes
Senior: 60 years and older All Classes excluding Junior Classes.