Women's Professional Motocross. Motocross is an off road racing sport that is raced on a dirt bike around a track, there are multiple riders going around at a time and the first person to complete the required number of laps in the shortest period of time wins. The women's motocross league is separate from men's motocross because of the different rules, and also the different bike sizes. Women generally race bikes that are 125cc or 250cc because they are not big enough to ride a 450cc. These differences make it hard for men an