An Olympic balance beam is 10 cm (4 in) wide. All balance beams that are used for competition are four inches wide. It is 10 cm (4 inches wide).
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I think a standard size beam, like the ones in competitions, is 4 inches. The wide or fat practice beams are usually six inches.
4 inches. It barely shows on the outside of the foot when you are standing on it. It is a thin piece of wood, the stuff that gymnasts do on there is not only amazing, but truly unbelievable.