Shimano Pedaling Dynamics
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Shimano Pedaling Dynamics, better known as SPD, has become a benchmark design for clipless mountain bike pedals. The SPD pedal was invented by Shimano in 1988. While not the first clipless pedal, the important innovation of the SPD was the particular method by which the recessed cleat pocket in the sole of the shoe was designed. The same year, LOOK designed a pedal which also used a recessed cleat. However, this particular cleat was rather large and never created a "design standard" by which other manufacturers could successfully utilize this particular design. Clipless pedals use a system of cleat retention not unrelated to ski bindings to allow for better pedaling efficiency. Generally, clipless pedals are seen to be safer than the old clip style of pedal/shoe integration.
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