A tyre mounting/demounting tool assembly for a tyre mounting/demounting machine comprises a carrier unit (100) having a first as well as a second end (112, 114) and being provided with first support means (120) for receiving a bead breaker tool (200) and second support means (130) for receiving a mounting support tool (300), a bead breaker tool (200) for loosening the tyre bead (TB) from the rim edge (RE) of a wheel (W), having a first as well as a second end (202, 204), the first end (202) is provided with at least one bead breaker tool element (210) and the second end (204) is adapted to be mounted to the carrier unit (100) via the first support means (120), and a mounting support tool (300) for supporting the mounting of at least one tyre bead (TB) of a tyre (T) to be mounted on a rim (R), the mounting support tool (300) having a first as well as a second end (302, 304), the first end (302) is provided with a mounting support tool ele-ment (310) and the second end (304) is adapted to be mounted to the carrier unit (100) via the second support means (130). The shape of the bead breaker tool element (210) and the shape of the mounting support tool (300) are at least partially congruent to each other.