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In the land of online sales its hard to get a gauge on what size bike you need for racing. It is always the best option to try and get down instore to be sized up as people have different proportions such as longer arms or shorter legs. However, you can use the information below as a guide to point you in the right direction.
Race BMX sizing tends to use names rather than top tube measurements and these can vary between manufacturer. For example a pro XL in one brand might be a 21 inch top tube but in another might be 21.25 so always check the spec on the bike/frame
| Riders Height (cm) | Size Name | Top Tube |
| Up to 120 | Micro-mini | 16.75" |
| 120-140 | Mini | 17.75" |
| 130-145 | Junior | 18.25" |
| 145-160 | Expert | 18.9" |
| 155-165 | Expert XL | 20" |
| 160-175 | Pro | 20.75" |
| 175-185 | Pro XL | 21" |
| Over 185 | Pro XXL | 21.5" |