Replacement cleats for all Shimano branded SPD pedals, except the PD-M858.
The SH-51 cleats are the standard cleats that ship with new Shimano pedals. They have four degrees of float and a slightly larger release angle than the SH-56 cleats. The cleats will only release with a lateral twist to the outside and are much more secure than the SH-56. Typically, they’re preferred by more experienced riders.
NOTE: These will not fit “SPD style” pedals from other brands. They're only compatible with Shimano pedals.