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Float
From WikiPedalia
A property of a clipless pedal system that allows the rider to rotate the foot within limits, as opposed to a fixed cleat which holds the shoe at a fixed angle in the yaw axis. Float helps to avoid knee problems, though for many cyclists it is sufficient for a cleat to be adjusted correctly. Most people toe out.
Pedals with float allow you to rotate your heel inward or outward to some extent before disengaging the cleat.
