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 in wheel size (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 | Bike Wheel Size | |
| 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 | |
