BMX Bike Size Guide
Please use BMX bike sizing as a guide only. Size guide does not take into account skill level or riding preference, so you may need to get a longer or shorter top tube length to suit your style of riding.
Junior (smaller than 20" wheels) BMX bikes sizing
| Rider Age | Rider Height | Bike Size |
| 1.5 - 4 years | 80 - 110cm | Balance Bike |
| 3 - 6 years | 95 - 115cm | 12" wheels |
| 4 - 8 years | 100 - 130cm | 14" wheels |
| 5 - 9 years | 110 - 140cm | 16" wheels |
| 7 - 12 years | 120 - 155cm | 18" wheels |
20" wheeled BMX bikes sizing
All bikes below have 20" wheels, which makes the top tube length the determining factor for optimum sizing.
| Rider Height | Bike Categories | Top Tube Length |
| 135 - 150cm | Youth BMX bike | 18.5" - 20.25" |
| 145 - 165cm | Youth BMX bike | 19.8" - 20.5" |
| 155 - 170cm | 20.25" - 20.75" | |
| 165 - 180cm | Adult BMX bike | 20.5" - 21" |
|
175cm + |
Adult BMX bike |
Larger than 20" wheeled BMX bikes sizing
BMX bikes with 22" - 27.5" wheels suit riders of many sizes, but can be more practical for taller riders.
| Rider Height | Wheel Size |
| 170cm + | 22" and up |
