If your under 5 years old then you need training wheels or you can help you son to learn how to ride a bike. If you want to ride your bike fast you have to pedal fast or if you have gears you can lose them. next stage of the process If your scared and you're going down a long hill then you can lose your gears of breaks. the final stage of the process If your going up a hill If I was you I will lose my gear or get a mountainbike. At the end they know how to lose their gears and there breaks when they up and down.