SM-SH51
FEATURES
For SPD, single direction release type
Release the cleats from the pedals by twisting your heels outward
Without cleat nut specification
Cold forged and specially heat treated to increase durability and rigidity for heavy use even under severe conditions.
SPD cleats are engineered specifically to match SHIMANO pedals and avoid damage — the big advantage of having single-source parts.

SM-SH56
FEATURES
For SPD, multi-directional release type
Release the cleats from the pedals by twisting your heels in any direction
Without cleat nut specification
Cold forged and specially heat treated to increase durability and rigidity for heavy use even under severe conditions.
SPD cleats are engineered specifically to match SHIMANO pedals and avoid damage — the big advantage of having single-source parts.