Abstract: A balancing apparatus for a grinding wheel or the like comprises members co-rotary with the object, members non-co-rotary therewith and weights coupled to the co-rotary members and having their gravity centers arranged displaceable relative to planes through the axis of rotation of the wheel. The weights are adapted for easy rotation on or with axles extending angularly in relation to the axis of rotation, and actuating means and the weights or axles are provided with toothed elements for the rotation of the weights. The weights comprise two first weights each of disc-shape and connected to each other by a central rotation axle portion, and two second weights, each of disc-shape and connected to each other by an intermediate bow portion offset from their rotation axle. The rotation axles of the first and second weights form substantially right angles with each other and with the rotation axis of the grinding wheel. The rotation axles of the first and second weights are located substantially in the same plane.