Replacement APS adjuster kit. Fits e*thirteen cranks machined to fit APS adjuster.
Versions are specific to crank arm type, choose between APS for aluminum arms or APS for carbon arms. Helix Alloy cranks have their own APS based upon model.
*Gen3 Carbon Crank APS adjusters use an aluminum outer ring and plastic inner ring. Typically when damage occurs, it is just to the plastic inner ring. If you need a new APS for your Gen3 Carbon Crank, simply order a Gen4 Carbon Crank APS, remove the inner ring and install it on your current aluminum outer ring.