Why custom cranks and how long to get them? The crank length calculator tool below is based around the following formulas.

* Crank length (mm) = Inseam (mm) X 0.216

Or, more conservatively for tall riders:

* Crank length (mm) = Inseam (mm) X 0.21

Additional Information on Custom Crank Lengths

Crank Length Calculator Inseam Length Inseam (in millimeters) eg: 94.2cm = 942mm Type Tall Cyclist (over 188cm) Other Cyclist