An adapter for a portable power-operated tool for breaking the bond between a tire rim and the bead of the tire mounted thereon, the adapter being particularly useful with rims comprising an annulus including a wheel disk or web interiorly of the annulus and having at least one aperture therein, usually centrally located. The adapter includes a beam having at least one horizontally extending flange and a projecting web, the flange having an axially extending slot therein to accommodate an axially slidable clamp which passes through the slot in the beam. Apparatus is provided for adjustably securing the clamp to the flange. The clamp includes a pivot plate which projects substantially parallel to the flange but spaced therefrom a distance greater than the thickness of a wheel disk. An offset portion of the beam extends therefrom and includes a yoke with means for quickly attaching and detaching the power unit to the yoke.
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