I have been driving something my whole life...starting on the farm when I could barely reach the peddles...raced bikes, raced cars, driven and am driving big rigs...logged over 3 million miles to date on the trucks alone, let alone 30 yrs of patrol cars......how the hell can balancing a tire on a car be any different than on a machine? As soon as the weight of the vehicle touches the pavement, and all it's weight is now on the wheels, it's has all changed. I have seen spin balancing while mounted on the truck, but, it isn't a bit different than having it done on the machine. The wheel is in the air...just sayin'...there isn't any majical machine out there I am aware of...that takes in the account of the car actually being on the ground. Unless there is something out there similar to a dyno, which allows your wheels to spin while the weight of the vehicle is on them, I can't see any difference. FUBU....nice purchase...now go rip some of that rubber off there and give us a photo of that bad boy...