Bikes
Bikes are used for a lot of things. There are road, mountain, and even BMX bikes.
BMX bike
A BMX bike is an off-road sport bicycle used for racing and stunt riding. BMX means bicycle motocross.
Road bike
a bicycle for use on paved roads as opposed to rough terrain or racing tracks, especially one designed for competitive cycling.
Mountain biking
a bicycle with a light sturdy frame, broad deep-treaded tires, and multiple gears, originally designed for riding on mountainous terrain.