内胎是指某些充气轮胎内部的可充气圆环。 [1]内胎由橡胶制成，通过气门嘴充气，并安装在外胎的空腔内。在内胎与轮辋间装有环形橡胶垫带，用来保护内胎。有内胎的轮胎广泛运用于自行车、摩托车、卡车和公共汽车等重型公路车辆。[2]
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