A BMX bike or BMX is the name of a popular bicycle which is used for both casual use and sport.BMX bike frames are made of various types of steel, and (largely in the racing category) aluminum. Cheaper, low end bikes are usually made of steel. Mid range bikes are mostly chromoly or hi tensile steel, which are about the same in weight and strength. High-performance BMX bikes use 4130 chromoly, or generation 3 chromoly.BMX Racing bike wheels vary in size, from 18″ to 26″ (with 20″ being the most popular).As a form of leisure activity or sport BMX has become popular. Enthusiastic people, especially children and teenagers will often attend BMX and skate parks and centres and sometimes compete in organised competitions. One form of BMX biking is Freestyle BMX.

BMX bicycles are available several distinct model types

• Race
• Freestyle (park,street,vert)
• Dirt jumping
• Flatland