Breaking the bead on a tire is the process of separating the tire from the rim. It is a necessary step when replacing a tire, as it allows the tire to be removed and the new tire to be installed. There are a few different ways to break the bead on a tire, but the most common method is to use a tire bead breaker.
A tire bead breaker is a tool that is specifically designed to break the bead on a tire. It consists of a metal hook that is inserted between the tire and the rim. The hook is then used to pry the tire away from the rim, breaking the bead.