When we were growing up the normal progression towards riding a two-wheel bicycle began with a tricycle. These three wheels helped us to grow accustom to pedaling and steering while providing the balance of three wheels and minimizing falls. Then we moved up to a two-wheel bicycle with training wheels. The same concept and advantages applied until we were ready to go it alone with only two wheels. Eventually, if we were bold and daring enough, our pedaling was replaced with a high performance motor and our two-wheeled bicycles became a motorcycle.