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Competition-grade bumper plates are more compact, with a layer of rubber surrounding a steel core. [28] [29] Bumper plates used in competition have a diameter mandated by the International Weightlifting Federation of 450 millimetres (17.72 in) ±1 millimetre (0.04 in), with lighter plates being narrower than heavier plates.
BUR did not manufacture Olympic bars or Olympic-sized plates. The original BUR-BEL plates had a center hole diameter of 1-1/4" and were designed to fit a 1-1/16" bar. Sometime in the 1950s, the bar diameter was reduced to 1" and the plates were drilled with a 1-1/16" hole.
Presently, Olympic plates of 10 kilograms (22 lb) or more are 450 millimetres (18 in) in diameter. 450 millimetres (18 in) versions also exist of the lighter 5 kilograms (11 lb) and 2.5 kilograms (5.5 lb) plates to accommodate the proper starting position for beginner athletes. These can be aluminium or plastic and may have rubber edges.
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Rogue originally started in 2007 in Toledo, Ohio, by Bill Henniger when he had difficulty finding the necessary equipment for his new gym, a CrossFit affiliate.He set up an e-commerce one-stop site roguefitness.com, with the intention of selling all the equipment necessary for a CrossFit gym. [2]
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