SHIMANO PD-M520L Clipless Bike Pedals 9/16in Shimano pedaling dynamics - spd performs whether youre on or off the bike; makes pedaling more efficient with a wide variety of shoe and pedal styles; and the recess cleat makes walking more comfortable Innovative - by eliminating toe-clips and integrating the pedal and outsole into a single; unified power transfer system; shimano changed the industry Incredible performance - spd not only boosting power to the pedal; but also the riders control over increasingly adventurous styles of riding Better control - you can pedal with greater efficiency; stability and comfort with the spd system Superior mud-shedding design - an open binding design allows mud and debris to be flushed out when the rider steps in