KICKR dedicated feet that reproduce left and right movements as standard as the latest kicker model (WFBKTR120). Supports left and right movements from 1 to 5 degrees to give you a close feel to the actual ride. It also helps reduce unnecessary fatigue during long rides, and also increases vibration absorption. This is a set of 3 types, hard, middle, and easy to use. The KICKR AXIS foot is compatible with the 16.17.18.20 generation KICKR Smart Trainer and also works with older versions. If you use the 16.17.18 version KICKR, you can upgrade your ride.