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This type of pedal requires a specialty type of shoe. The bottom of the shoe has built in holes to bolt a cleat to. These pedals can be single-sided, dual-sided, or four-sided. This cleat clicks into the pedal like a ski boot and binding combination. Clipless pedals are most commonly used for road biking and mountain biking. These are most commonly used by racers. There are several types of clipless pedals. SPD and SPD-SL are the most common.