Class
Engine
Age
Weight
Tires
MicroMax
Rotax Micromax
7-9
235lbs
Mojo D2
MiniMax
Rotax Mini
9-12
265 lbs
Mojo D2
Junior Max
Rotax Junior
13-16
320 lbs
Mojo D2
Senior Max
Rotax FR-125
15+
365 lbs
Mojo D2
Rotax Masters
Rotax FR-125
16+ (190 lbs driver) otherwise 32+
405 lbs
Mojo D2
DD-2
Rotax DD-2
15+
385 lbs
Mojo D3
         

Complete Rotax class rules can be found at www.rmaxchallenge.com.