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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.
SPD-SL, Look Delta, Look Kéo, and Time cleats are also available in three-degree and zero-degree float. Road pedal systems commonly colour-code cleats by the amount of float offered. Some pedal systems have a fixed (non-adjustable) float, such as six degrees for Crankbrothers and 4.5 degrees for the Kéo Easy.
SPD has spawned two types of road cleats that are incompatible with standard SPD pedals and some shoes – SPD-R and SPD-SL. SPD-R is a now-defunct pedal standard. SPD-SL is basically a copy of the standard Look clipless pedal system. It has a wide, one-sided platform and a triangular cleat that is Look three-bolt compatible.
Modern cycling shoes are designed to work with clipless pedal systems. Such systems temporarily connect the shoe to the pedal in a manner similar to a ski binding system. The aim is maximal efficiency of power-transfer, using a cleat on the sole of each shoe and a matched fitting on the pedal.
Simplified control. Operation through the full range of forward and reverse speeds can be controlled using a single lever or a foot pedal to actuate a diversion valve or variable-displacement pump. Arbitrarily slow crawl speeds. The potential for high torque multiplication at very low speeds allows for precise vehicle movement while under load.
Since track bikes have a fixed gear, braking can be accomplished by reversing the force on the pedals to slow down, or by locking the pedals backwards and inducing a skid. Fixed gear road bikes may also lack brakes, and slowing or stopping is accomplished as with a track bike. Many fixed gear bikes however are fitted with a front brake for ...
In 1985, the La Vie Claire team, led by Bernard Hinault, won the 1985 Tour de France using LOOK's PP65 pedals, marking a turning point in cycling technology. The success of the pedals helped establish clipless systems as a staple in professional cycling. [4] [5] LOOK's pedal designs would go on to inspire rival manufacturers for years. [6]
Pedal-based power meters can be located either in the pedal axle or in the pedal body. This type of cycling power meter measures the cyclist’s force exactly where it is applied, through one or both pedals. Power meters with sensors on both pedals can provide a real dual-sided power measurement, that is power data gathered individually on both ...
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