8-11 year olds or 120-148cm-24" kids bikes Youngsters's 24 inch geared bikes are appropriate for children aged 8–13. These 24 inch motorcycles are constructed in the form of a mountain bike, with equipment such as gears and suspension forks. A kid's bike will usually have smaller wheels than adult bikes (typically 22 to 28 inches), thinner tires (usually 700c instead of 26"), and less suspension travel (usually about 150mm instead of 200 or more). Some manufacturers make kids' bikes without rear brakes because children can be expected to learn how to ride with only a front brake. 13-16 year olds or 148-175cm-56" kids bikes Older teenagers and adults may choose to purchase larger sized bikes that are better suited to their age and riding experience. These bikes typically have larger wheels (29" or more), thicker tires (700c or more), more suspension travel (250mm or more), and more expensive options like disc brakes and full fenders. The best kids' bikes for your child will depend on their age, riding experience, and transportation needs. There are two types of kids' bikes: geared and non-geared. Gearing refers to the use of gear ratios to increase or decrease the speed of the pedal rotation. This allows young riders to go slower on long stretches of road and faster up hills.