Instructions for making your own tire mount & balance equipment:
http://www.clarity.net/~adam/tire-changing-doc.htmlHere's what the above link's bead breaker looks like:
Other popular bead breaking items to use are C-clamps, jacks and hydraulic presses.
(The Jeep/4x4 crowd has even been known to run over a tire with another rig to break a bead - but I wouldn't recommend that method for m/c wheels.)