Abstract: A tire inner tube primarily includes an inner tube body being a hose having two closed ends and a charging air inlet being positioned at an inner side of the inner tube body, wherein the closed ends of the inner tube body are configured to be removably combined and form the inner tube body into a closed loop that fits a tire rim of a bicycle, so that the tire inner tube is allowed to be mounted around or demounted from the tire rim without removing the tire rim from the bicycle.