Abstract: The present invention relates to a rotatable wheel rim support group designed to be mounted on an assembling-disassembling machine (MT) having a base (10), a control shaft (9) extending upwards from the base (10), removable locking means (11) for the wheel rim (C) which is engageable, in use, on the control shaft (9) and with a side of the wheel rim (C), and actuating means (M) for the control shaft (9).