[chopper]

Perhaps I should offer a bit of clarification on my personal experience. The tire shop charged $5 per wheel to do a standard spin balance, and an additional $10 per wheel to do the "road matching" for a total of $15 per wheel. That includes lifetime re-balancing, any time I wish to take the car into their facility. FWIW, I stood and watched the guy at Discount do my four wheels. The manager came out and took the time to explain what they were doing, what they were looking for, and what the acceptable allowances were. I stood there and watched the serviceman index (rotate) all four tires relative to the rims to get the lowest readings. Not to disagree with Mr. Turk, but this particular shop apparently feels they can make money by doing this at $60 per car, and it seems to work very well. The tires in question were the Yoko AVS 100s, mounted on the stock 16" Miata rims.