12-inch
The first bike that you buy for your child will most likely be a 12-inch bicycle. A 12-inch bicycle will fit most children between the ages of two and four. Many of them come with training wheels, full chain coverage and fun extras such as baskets, bags or tassels.
16-inch
A 16-inch bicycle fits children aged five through eight. Depending on the manufacturer, some 16-inch bikes come with rear coaster brakes and others with hand brakes. Before buying a bike with hand brakes, make sure that she has the manual dexterity to safely use them.
20-inch
If your child is between seven and 10, a 20-inch bike will usually be the best fit. These bikes usually have regular hand brakes and various speeds. Shifting between different gears can be challenging, so remember to spend a good deal of time observing your child's coordination before purchasing a 20-inch bike with multiple speeds.
24-inch
Many children over the age of 10 will be able to ride a 24-inch bike. These bikes offer many features and options that are the same as adult bikes. Adult bikes are typically 26 inches, so 24-inch bikes are slightly smaller.
