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2. Shimano Pedaling Dynamics - Wikipedia

   en.wikipedia.org/wiki/Shimano_Pedaling_Dynamics

   Shimano Pedaling Dynamics, commonly called SPD, is a design of clipless bicycle pedals and associated cleats first released by Shimano in 1990. [1] [2] The first model, PD-M737, was aimed at mountain biking enthusiasts who, prior to this, had to use toe clips and straps or "road" clipless pedals which clogged with mud and made walking very difficult in unrideable situations.

3. Shimano - Wikipedia

   en.wikipedia.org/wiki/Shimano

   SPD ("Shimano Pedaling Dynamics") SPD clipless pedal PD-M520 The SPD pedal was released by Shimano in 1990 and forms one part of a clipless bicycle shoe/pedal system. While not the first, its innovation was its small cleat which fitted into a recess in the sole of a shoe designed for SPD use.

4. Bicycle pedal - Wikipedia

   en.wikipedia.org/wiki/Bicycle_pedal

   Then, instead of loosening a toestrap or pulling a lever, the cyclist releases a foot from the pedal by twisting the heel outward. SPD Dual Choice with shoe. The next major development in clipless pedals was Shimano's SPD (Shimano Pedaling Dynamics) pedal system. Whereas Look cleats are large and protrude from the sole of the shoe, SPD cleats ...

5. Cycling shoe - Wikipedia

   en.wikipedia.org/wiki/Cycling_shoe

   Most of these cleats follow Shimano's "SPD" system (“Shimano Pedal Dynamics”). Other two-bolt cleat and pedal systems for use with casual cycling and MTB shoes are produced by Crank Brothers, Speedplay and Ritchey, to name a few. Casual cycling shoes normally have a US retail price of under $100. Sizes range from 35 to 50 in European sizing.

6. Mike King (BMX rider) - Wikipedia

   en.wikipedia.org/wiki/Mike_King_(BMX_rider)

   Wellgo Quill Platform Pedal. This design is practically identical to the Shimano "DX" pedals first introduced in 1981 for BMX racing. [29] Bicycle pedal with standard toe clip and toe strap, quill road type. Early 1980s. Road Cycling version of clipless pedals: SPD Dual Choice with shoe

7. Precession (mechanical) - Wikipedia

   en.wikipedia.org/wiki/Precession_(mechanical)

   Shimano SPD axle units, which can be unscrewed from the pedal body for servicing, have a left-hand thread where the axle unit screws into the right-hand pedal; the opposite case to the pedal-crank interface. Otherwise precession of the pedal body around the axle would tend to unscrew one from the other.