Abstract: A wheel-balance machine is provided in which a wheel and tire combination is mounted on a rotatable hub. The hub may be adjusted to be freely rotatable so as to determine and compensate for static unbalances of the tire/wheel combination, and it may be controlled to be rotated at high speed, so as to determine any dynamic unbalances in the tire/wheel combination. A power-driven abrasive wheel is also mounted in the machine, and it is driven rotatably and in a reciprocal longitudinal manner to grind the peripheral surface of the tire, in order to true the periphery of the tire with respect to its axis of rotation. Electric lamp indicators are provided which are selectively de-energized during the dynamic balance test of the tire/wheel combination, and which serve to indicate the angular positions on the tire at which compensating balances should be mounted to offset the dynamic unbalance.