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Kids' Bike Sizing Guide

What is the Right Size Bike for My Child?

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Portrait of red headed boy on his bicycle in the driveway, two boys on bikes behind him. They wear helmets.
AE Pictures Inc./Digital Vision/Getty Images

Use the sizing chart below to figure out how kids' bikes are measured and defined, and to know best what you're looking for when shopping for a particular bike. An important thing to know is that kids' bikes are measured using the outside diameter of the tire (diameter). This is in contrast to adult bikes, whose measurements refer to frame size.

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Guide to Kid's Bike Sizes
Age  Child's Height   Tire Diameter (outside) 
Age 2 - 5 26 - 34 inches 12 inches
Age 4 - 8 34 - 42 inches 16 inches
Age 6 - 9 42 - 48 inches 18 inches
Age 8 - 12 48 - 56 inches 20 inches
Youth 56 - 62 inches 24 inches
Related Video
How to Size a Kid's Bike
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