Cale essential for optimal foot Yield Bond without too much hassle with automatic pedals difficult to manage in the city. Allows a net energy gain pedaling without using special shoes, then for sure you can not pull up as with pedals clipped, but this is a good compromise that allows to free his foot very Naturally in case of abrupt stop or traffic lights. The installation is very simple, we unclipped the orange reflector on the original pedal and then screw the 2 screws + nut, taking care to center the footrest relative to the pedal, and that's it.