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 InseamCrank 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