Kids bikes and junior bikes are made for children of all ages to enjoy the freedom of cycling. The first thing you will want to know is which size kids bike your child needs. Unlike adult bikes which are sized by their frame, kids’ bikes are sized by their wheels. A 12” wheel bike is for a 2-4 year old, a 16” wheel bike for a 5-7 year old, a girls 20” bike or a boys 20” bike will fit a 7-10 year old, while a 24” bike is good for riders 10 years and over. The age categories are a guide as height also plays an important part in bike sizing for kids.