An acronym for "Shimano Pedaling Dynamics", a design of clipless bicycle pedal created by Shimano, Inc. Both road and mountain variants exist as do numerous "SPD-compatible" designs.

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SPD PD-M520 Pedals, replacing the Body Cover

I have taken the body cover off my Shimano PD-M520 pedals and am unable to get it back on due to a little nodule having to be behind the bit of metal where the tightness ajustment is. That part is ...