Wikipedia:
bead breaker
A bead breaker is a tool used for separating tires from rims. The inside ring of the tire is called the lip, and the bead on the lip seals to the rim in a radial-ply tire trapping air inside. Often, the bead can become frozen to the rim after rusting occurs requiring the use of a bead breaker and usually a base upon which the wheel is mounted.
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