BMX Crank Length Sizing Chart
Crank Arm Sizing Chart
The chart below can be used to estimate your proper crank arm length. Your choice of cranks may vary depending on rider style and skill level. Crank arm length is an important factor to consider with BMX racing and children's 12", 14", 16" and 18" bicycles. For adult freestyle riders the typical crank arm length will vary between 160mm up to 180mm depending on your riding style. Many street and park riders prefer a shorter (160mm - 170mm) crank arm length.
| Rider Inseam | Crank Length |
|---|---|
| 20" | 140mm |
| 21" | 145mm |
| 22" | 150mm |
| 23" | 155mm |
| 24" | 160mm |
| 25" | 162mm |
| 26" | 166mm |
| 27" | 171mm |
| 28" | 175mm |
| 29" | 177mm |
| 30" | 180mm |
| 31" | 182mm |
| 32" | 185mm |
| 34" | 190mm |