Revised 2.14.20
Red Denotes Changes for 2020
| CLASS | RESTRICTION | DISPLACEMENT | LAPS** | |
| PRO: Riders must be 17 or older on date of event to compete | ||||
| Pro-Am & A: Riders must be 16 or older on date of event to compete | ||||
| 1 | AMA Pro | Production | 350-450cc 4-Stk | 18+2 |
| 2 | Pro Mod | AMA Pro/Pro-Am | 91-265cc 2-Stk; 201-450cc 4-Stk | 7 |
| 3 | Pro Stock | Production Stock | 201-450cc 2-Stk/4-Stk | 6 |
| AMA Pro/Pro-Am/A | ||||
| AMATEUR: Riders must be 16 or older on date of event to compete | ||||
| 4 | Pro-Am | Pro-Am/A | 201-450cc 4-Stk | 7 |
| 5 | WMX | 201-450cc 4-Stk | 5 | |
| 6 | Open B | 201cc-Open | 4 | |
| 7 | Open C | 201cc-Open | 4 | |
| 8 | Production A | Production | 201-450cc 4-Stk | 5 |
| 9 | Production B | Production | 201-450cc 4-Stk | 4 |
| 10 | Production C | Production | 201-450cc 4-Stk | 4 |
| 11 | Production Stock | Production Stock | 201-450cc 2-Stk/4-Stk | 4 |
| 12 | Production Stock C | Production Stock | 201-450cc 2-Stk/4-Stk | 4 |
| 13 | 450 A | 201-450cc 4-Stk | 5 | |
| 14 | 450 B | 201-450cc 4-Stk | 4 | |
| 15 | 450 C | 201-450cc 4-Stk | 4 | |
| 16 | College (16-24) | Sportsman | 201cc-Open | 4 |
| 17 | Junior 25+ | 201cc-Open | 5 | |
| 18 | Veteran 30+ | Sportsman | 201cc-Open | 4 |
| 19 | Veteran 30+B | 201cc-Open | 4 | |
| 20 | Veteran 30+ C | 201cc-Open | 4 | |
| 21 | Senior 40+ | 201cc-Open | 4 | |
| 22 | Senior 40+ B | 201cc-Open | 4 | |
| 23 | Senior 40+ C | 0 | 201cc-Open | 4 |
| 24 | Masters 50+ | 201cc-Open | 4 | |
| 25 | Women (25+) | 201-450cc 4-Stk | 4 | |
| YOUTH CLASSES: Age is based on the rider's age on January 1 | ||||
| 26 | Youth All-Star (14-17) | 91-200cc 2-Stk, 91-250cc 4-Stk | 4 | |
| Production* | 201-400cc 4-Stk* | |||
| 27 | 250 Mod (13-15) | 91-200cc 2-Stk; 91-250cc 4-Stk | 4 | |
| Production* | 201-400cc 4-Stk* | |||
| 12 yr old: 71-105cc 2-Stk; 75-150cc 4-Stk | ||||
| 28 | Schoolboy Sr. (14-17) | 91-200cc 2-Stk; 91-250cc 4-Stk; | 4 | |
| Production* | 201-400cc 4-Stk* | |||
| 29 | Schoolboy Jr. (12-15) | 71-105cc 2-Stk; 75-150cc 4-Stk | 4 | |
| Production* | 91-200cc 2-Stk*; 91-300cc 4-Stk* | |||
| 12 yr old: 71-105cc 2-Stk; 75-150cc 4-Stk | ||||
| 30 | Super Mini (12-15) | 71-105cc 2-Stk; 75-150cc 4-Stk | 4 | |
| 31 | Schoolgirl (13-17) | 91-200cc 2-Stk; 91-250cc 4-Stk | 4 | |
| Production* | 300-400cc 4-Stk* | |||
| 12 yr old: 71-105cc 2-Stk; 75-150cc 4-Stk | ||||
| 32 | Girls (8-13) | 70-90cc 2-Stk; | 4 | |
| Production* | 125cc 4-Stk* | |||
| 33 | 125 (8-15) | Production | 90-125cc 4-Stk | 4 |
| 34 | 90 Open Sr. (12-15) | 71-90cc 2-Stk; 125cc 4-Stk | 4 | |
| 35 | 90 Open Jr. (8-11) | 71-90cc 2-Stk; 125cc 4-Stk | 4 | |
| 36 | 90 Automatic (8-13) | Production | 71-90cc 2-Stk; 125cc 4-Stk; Automatic/CVT/Single Speed | 4 |
| 37 | 90 Shifter Sr. (12-15) | 71-90cc 2-Stk; 125cc 4-Stk; Shifter | 4 | |
| 38 | 90 Shifter Jr. (8-11) | 71-90cc 2-Stk; 125cc 4-Stk; Shifter | 4 | |
| 39 | 70 Open (6-11) | 51-70cc | 4 | |
| Production* | 125cc 4-Stk* | |||
| 40 | 70 Automatic (6-11) | Production | 51-70cc; Automatic/CVT/Single Speed | 4 |
| 41 | 70 Shifter (6-11) | 51-70cc; Shifter | 4 | |
| Production* | 125cc 4-Stk* | |||
| 42 | 50 Open (4-8) | 0-50cc | 4 | |
| 43 | 50 CVT (4-8) | Production | 0-50cc; Belt-Drive | 4 |
| 44 | 50 Automatic (4-6) | 0-50cc; Automatic/CVT/Single Speed | 4 | |
*Production Rule only applies to displacement designated.
**Laps are 'weather permitting'. Pro/Pro-Am reference is to time, then laps.
Red Denotes Changes for 2020