Abstract: A cycle seat clamp for selectively securing a cycle seat having a saddle and a truss to support posts having differing sizes is comprised of a first receptacle for receiving a support post of one size, a second receptacle connected to the first receptacle for receiving a support post of a second size, and a compression member for compressing one of the receptacles against a received support post to secure the cycle seat thereon. Also disclosed is a cycle seat comprising a clamp of the foregoing type.