Metric (cm)
| Model | Recommended rider height (cm) | Recommended rider age |
| Bug | 90 - 120cm | 3 - 6 years |
| Kickstart | 120 - 170cm | 6 - 15 years |
| Pro | 160cm and over | 12 years and older |
| Pro V2 | 150 - 160cm and over | 12 years and older |
Imperial (ft, in)
| Model | Recommended rider height (ft,in) | Recommended rider age |
| Bug | 3'0" - 3'11" | 3 - 6 years |
| Kickstart | 3'11'' - 5'7'' | 6 - 15 years |
| Pro | 5'3" and over | 12 years and older |
| Pro V2 | 4'9'' - 5'3'' and over | 12 years and older |
