Bruce L. Bergman wrote in news: snipped-for-privacy@4ax.com:
Or you can just mount the damn things properly in the first place. Most tires are badly mounted, even the ones done with whiz-bang golly-gosh equipment.
Raise the car and spin the wheels. You'll see why "perfect balance" still vibrates.
Those "road force" balancers cannot MOUNT the tires properly. Worse, they can fail perfectly good tires that are poorly mounted because they will be reporting "road force variance" that is simply due to the poor mounting.
How many tire monkeys can tell you what those red and yellow dots are for? How many shops actually USE those dots? How many tire shops use tire mounting paste instead of dish soap? Very, very few.
They also never pass up an opportunity to hire monkeys and train them badly.