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Tubeless tire
Tubeless tires or tyres (in some Commonwealth Nations) are pneumatic tires that do not require a separate inner tube.
Unlike pneumatic tires which use a separate inner tube, tubeless tires have continuous ribs molded integrally into the bead of the tire so that they are forced by the pressure of the air inside the tire to seal with the flanges of the metal rim of the wheel.
==History==
Many patents had been filed covering tubeless tires. ''Killen Tire'' applied for a patent in 1928 and was granted in the UK in 1930. The Wingfoot Corporation, a subsidiary of Goodyear Tire were granted a patent in South Africa in 1944. Due to technical problems, most of these designs only saw limited production or were abandoned.
Frank Herzegh working for BF Goodrich applied for a patent in 1946 and eventually received in 1952 in the United States. By 1955 tubeless tires became standard equipment on new cars.〔(【引用サイトリンク】title= B.F. Goodrich Co. announces development of tubeless tire )〕 BF Goodrich had to defend their patent in court several times, due to the similarities of previous designs. The primary difference between the BF Goodrich design and their predecessors was the usage of butyl rubber, which was more resistant to air leakage than the natural rubber used in the other designs.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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