I found that some of the more modern all “singing and dancing” balancing machines come up with wheel mounting errors when the balancing cones are used, as the electronics think that the wheel is not mounted correctly against the backplate. I use a local outfit who thankfully still have an older machine in use.
Some companies will balance without cones and sometimes are lucky to get away with it, if the wheel is in excellent trim, but for a proper job, cones are essential.
