Replacement crank arm  9/16" thread size (LEFT SIDE)

Crank arm length-6.25"

Fits Model FDX 2.0 and FDX 3.0

Please note this will not fit the  model 4100, 4150 and 3030 under desk cycle. It will fit the model 4100 and 4150 but new pedals will be needed.

A crank removal tool is needed to replace the crank arm.  https://thefitdesk.com/collections/replacement-parts/products/crank-removal-tool