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Message: [QUOTE="oldguy, post: 1184967, member: 16965"] A, B, and C designate rider levels with A being top and C (in some areas D) being beginner. 125 and 250 designate the bike sizes for the class. 125 is now usually 2 strokes up to 144cc and 4strokes up to 250cc 250 class is 250cc 2 strokes and up to 450cc 4 strokes Schoolboy is any size bike ( we have an additional class in our district of 125Jr where only 125cc 2 strokes are allowed) ages 13 to 16 and often levels C and B College boy is 16 to 24 yeears old any bike size levels C and B Some areas do allow A riders in the schoolboy and collegeboy [/QUOTE]