Heavy Duty inner tube: 700x18C/25C FV60mm (18/25-622) Heavy duty bicycle inner tube, these inner tubes are ideal for a wide range of applications. Enhanced the ductility of the heavy load tire, so that the scope of application is expanded, with 700x18C 700x19C 700x20C 700x21C 700x22C 700x23C 700x24C 700x25C tires.
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