Shimano invented SPD. Since then, weight has decreased while mud clearance has increased. Thanks to Shimano&';s expertise in bearings, forging and pedaling dynamics, the reliability of SPD has always been the benchmark in the industry. Inspired To Tackle Single Track And Technical Descents With Control And Confidence. KEY FEATURES: a Wider and longer contact area provides more solid pedal - shoe interface and transmits power efficiently for better bike control a Fine tuned to work efficiently with both ME and AM shoes a Integrated cage not only protects the binding from impacts but also makes stepping-in easier working as a guide a Better bike control a Focus on riding a Improved axle durability