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A frock coat is a men's coat style of the nineteenth century, characterized by full skirts reaching to the lower thigh or knee. Despite the similarity in the name, the frock coat should be regarded as being a distinct garment quite separate from the frock. In the French language the frock coat is called 'une redingote' (from English "riding coat"), and so unlike the English language implies no immediate relationship to the frock which is called 'une fraque'. Indeed the modern French word for a tail coat is "une frac" which better betrays the historical relationship between the tail coat and the frock. In construction the frock coat could scarcely be more different from the frock for unlike the latter it is usually double breasted, lacks any pockets, lacks a high collar, has V-shaped lapels, is closely fitted and is constructed with a waist seam.
A frock motor is a hub motor frequently fitted to electric bicycles. Unlike belt or chain driven motors which can pose a hazardous entanglement risk to those wearing long or loose garments, the hub motor is laced into the center of the bicycle's wheel. With no fast moving parts near the rider's legs it poses little threat to those wearing frock-like garments. Frock motors are either internally geared or direct drive and come in various sizes depending on their power output. They are the most common type of electric bicycle motor and are fitted to millions of bicycles throughout China and around the world.
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