What size BMX frame do I need? BMX frame sizes are measured by the toptube length, as illustrated below.
BMX Frame Sizes
BMX frame sizes are determined by the rider’s height as well as personal preference. For a general sizing reference, please refer to the BMX frame size chart below.
| Rider Height |
Rider Height |
Frame Size |
|---|---|---|
| 4’8″ - 5’2″ | 142 - 157cm | 18.5″ - 20″ |
| 5’0″ - 5’4″ | 152 - 163cm | 20″ - 20.25″ |
| 5’2″ - 5’6″ | 157 - 168cm | 20.25″ - 20.5″ |
| 5’4″ - 5’8″ | 163 - 173cm | 20.5″ - 20.75″ |
| 5’6″ - 6’0″ | 168 - 183cm | 20.75″ - 21″ |
| 5’8″ - 6’2″ | 173 - 188cm | 21″ - 21.25″ |
| 6’0″ + | 183cm + | 21.25″ + |
Tips
Personal preference can also play an important role when choosing a frame size. You may want to size up for a more comfortable, open-feeling ride, ideal for trail and transition riding. Conversely, you may want to size down for a more compact, nimble feel, which is often preferred for street, plaza, and park riding. In general, it’s best to stay within ±0.25″ of the recommended size.
When choosing a frame, there are several other dimensions to consider, such as chainstay length, standover height, and more. However, the toptube length is the most important measurement to ensure a proper fit.
If the rider is still growing, you may want to consider sizing up slightly. Please note that this guide is not intended for BMX racing or flatland bikes.
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