Mountain bikes differ from other bikes primarily in that they incorporate features aimed at increasing durability and improving performance in rough terrain.
The term road bicycle is used to describe bicycles built for traveling at speed on paved roads. Some sources use the term to mean racing bicycle.
Bicycle racing that resembles motocross with dirt tracks and jumps and the use of special heavy-duty bicycles.
City bike is a bicycle designed for frequent short, moderately paced rides through relatively flat urban areas.
Playing is one way to train the child's body balance. Play a bike is one way to train the balance of the child.