In the general safety info that comes with shimano PD-M520 it states, " Use only shimano single release mode cleats (SM-SH51). Other types of cleats such as SM-SH52
/ SM-SH55 cleats cannot be used, as they do not provide stable enough step-out performance or sufficent holding force."
Any experience with this. I have never had any problems.
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Thread: Shimano Cleat Question
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