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Class  
51cc Limited (ages 4-6) Single-speed automatic. Maximum (adjusted length) wheelbase 36 inches. Maximum wheel size 10 inches. Maximum seat height 24 inches. No larger than 14 mm round intake. All AMA approved Class 1 minicycles are allowed.
51cc Limited (ages 6-8) Single-speed automatic. Maximum (adjusted length) wheelbase 41 inches. Maximum wheel size 12 inches. Retrofitted 12-inch wheels are permitted on all class 2 minicycles. OEMs part must be used. No larger than 19mm round intake. All AMA approved Class 1 and Class 2 minicycles are allowed.
51cc Limited (ages 4-8) 51cc Limited 4 - 6 AMA Class 1 and 51cc Limited 7 – 8 AMA Class 2 minicycles are both approved in this class.
65cc (ages 7-9) Minimum wheel size 12 inches. Maximum front wheel 14 inches. Maximum (adjusted length) wheelbase 45 inches. Maximum wheelbase must maintain manufacturer specifications.
65cc (ages 10-11) Minimum wheel size 12 inches. Maximum front wheel 14 inches. Maximum (adjusted length) wheelbase 45 inches. Maximum wheelbase must maintain manufacturer specifications.
65cc (ages 7-11) Minimum wheel size 12 inches. Maximum front wheel 14 inches. Maximum (adjusted length) wheelbase 45 inches. Maximum wheelbase must maintain manufacturer specifications.
85cc (ages 9-12) Maximum front wheel 17” Minimum rear wheel 12” Maximum rear wheel 16” Maximum wheel base 51”
85cc (ages 9-15) Maximum front wheel 17” Minimum rear wheel 12” Maximum rear wheel 16” Maximum wheel base 51” 
Mini Senior Maximum front wheel 17” Minimum rear wheel 12” Maximum rear wheel 16” Maximum wheel base 51”
Supermini 1 Maximum front wheel 19” Maximum rear wheel 16”  Maximum wheel base 52”
Supermini 2 Maximum front wheel 19” Maximum rear wheel 16”  Maximum wheel base 52”
Schoolboy 1 Minimum front wheel 19” Minimum rear wheel 16”
Schoolboy 2 Minimum wheelbase 53” No minicycle or supermini
125cc B/C Minimum wheelbase 53” No minicycle or supermini
Collegeboy Minimum wheelbase 53” No minicycle or supermini
25 + Minimum wheelbase 53” No minicycle or supermini
30 + Minimum wheelbase 53” No minicycle or supermini
35 + Minimum wheelbase 53” No minicycle or supermini
40 + Minimum wheelbase 53” No minicycle or supermini
Women Minimum front wheel 19” Minimum rear wheel 16”
250 B Minimum wheelbase 53” No minicycle or supermini
250 C Minimum wheelbase 53” No minicycle or supermini
Open B Minimum wheelbase 53” No minicycle or supermini
Open C Minimum wheelbase 53” No minicycle or supermini
250 SX Futures *Minimum front wheel 19” Minimum rear wheel 16”
Open A #Minimum front wheel 19” Minimum rear wheel 16”

* - Riders that currently hold or have held a Supercross license in the past three competitive seasons are not allowed to compete in this class

# - Riders that currently hold a Supercross license are only allowed to compete in this class.

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