12" wheel classes- YSR, NSR, Metrakit
1. Stock YSR
2. Mod YSR-50cc max
3. Super Mod –59cc air cooled, 50cc water cooled
4. Unlimited-up to 84cc any chassis


Big Wheel classes-Derbi, Aprilia, DT, NS
5. Mod Production-50cc, pipe, carb, porting
6. Unlimited Production-up to 82cc


GP Classes
7. 80GP Junior (ages 10-13)-2 Stroke, 100cc max, any wheel or chassis (i.e. RS, TZ CR, RM, KX, YZ, Metrakit Unlimited YSR ok)
8. 80GP Expert (ages 14-up) 2 Stroke, 100cc max, any wheel or chassis


Pocketbikes/Sidecars
9. 40cc max


Womens only class
10. Novice and Expert, Stock YSR thru Big Wheel and Stock Thunder


4 Stroke Classes
11. Junior Stars (ages 5-9) Honda XR50, PW50 JR50 ok, any tire (no knobbies) 50cc max, after market pipe,
12. Unlimited Mini (ages 10-up) Honda XR50 based bike, engine max 110cc, any chassis, tire, brake mod.
13. Stock Thunder- 4 stroke dirt based bike up to 125cc (i.e. XR, DRZ, TTR, KLX) no mods allowed other than tires and controls (bars, levers, grips etc.) must run stock pipe and airbox etc..
14. Unlimited Thunder- Modified 4 strokes up to 170cc, any wheel, tire, brake or chassis

Novice Classes
15. Novice 50
16. Novice 80