Un radio o rayo de una rueda es cada una de las barras que une rígidamente la zona central con la perimetral. El centro conecta con un eje que, a veces, transmite a la rueda la tracción motriz.

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A spoke is one of some number of rods radiating from the center of a wheel (the hub where the axle connects), connecting the hub with the round traction surface. The term originally referred to portions of a log that had been split lengthwise into four or six sections. The radial members of a wagon wheel were made by carving a spoke (from a log) into their finished shape. A spokeshave is a tool originally developed for this purpose. Eventually, the term spoke was more commonly applied to the finished product of the wheelwright's work, than to the materials he used.

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