I have a car in Brazil, and did have the tyres balanced in situ! I've never seen it before, but they jacked the wheel up, put a white mark on it for a strobe pick up, and spun the wheel up to speed with a roller on the machine that the operator was sitting on. Then it told him how much and where to put the weight! It was an old machine, and worked very well. I've never seen anything like it before or since, but it does make sense to balance the whole rotating mass. However... don't think that you're going to get it done so easily in England or USA where I live! Posted by IanHardaker 21/03/2019 00:46:06