To provide a bead breaker group with a simple structure precisely positioned and suitable for easy and quick insertion between a tire bead and a rim part.

This bead breaker group includes supports 2, 5 and at least one bead breaker tool 3 mounted for rotation around a pin 4 borne by the supports 2, 5. The bead breaker tool 3 is substantially flat and includes at least one portion configured as an abutment front 3b against a flange of a rim of a tired wheel to be bead broken, and at least one portion having curved peripheral edge substantially coaxial with the pin 4 and intended to act as an engagement-penetration zone 3a between the flange of a rim and the bead of a tire to be bead broken. A distance between the abutment front 3b and the pin 4 is less than a distance between the pin 4 and the at least one engagement-penetration zone 3a.