Designed for optimal playability, the Concept Series pedal is a boutique-inspired machine that’s quick and responsive. The single-post design is outfitted with a dual chain concentric drive system, smooth cast extended footboard with integrated needle bearing hinge, and an offset toe clamp. Concentric Cam and Dual Chain-Drive. Single-Post Frame with Spring Rocker. XF Extended Footboard with Needle Bearing Hinge.