Shimano Pedaling Dynamics

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Clipless pedal Shimano PD-M520. They are easier to clip in to because they are double sided, compared to "road" SPD which has just one side for clip in

Shimano Pedaling Dynamics, also known as SPD system, is a design of clipless bicycle pedals. The SPD pedal was released by Shimano in 1990.[1][2] While not the first, its innovation is a small cleat which fits in a recess in the sole of a shoe designed for SPD use.

Shimano MT31 shoe with SH56 cleat

Shimano makes a number of different SPD cleats, and not all cleats are compatible with all pedals, especially between "road" and "mountain" SPD product lines. Among otherwise-compatible cleats, there is an important distinction between black "single release" cleats (SM-SH51) and silver "multi release" cleats (SM-SH56). The former can only be released from the pedal by twisting the heel outwards, while the latter can also be released by a sharp pull upwards and are therefore easier to use for novices.

There is a small allen key adjustment for the strength of heel twist to release, so beginners can have it 'soft' and easy to get out, and then tighten it up as they progress.[3]


  1. ^ Philip Kotler; Waldemar Pfoertsch (17 May 2010). Ingredient Branding: Making the Invisible Visible. Springer Science & Business Media. pp. 200–. ISBN 978-3-642-04214-0.
  2. ^ Ed Burke (2003). High-tech Cycling. Human Kinetics. pp. 48–. ISBN 978-0-7360-4507-0.
  3. ^ Tim Toyoshima (1995). Mountain Bike Emergency Repair. The Mountaineers Books. pp. 41–. ISBN 978-0-89886-422-9.