I am basing my information on a friend who repairs bikes as a side business. He replaces about 50 to 60 pairs of motorcycle tires a year. Very seldom do the wheels need balancing after replacing the tires. As far as his experience has been, only when they were already out of balance or the rim weights came off during the exchange. I don't know that much about car tires. When we changed my tires on my bike they were fine and didn't need balancing. It certainly doesn't hurt to check the balance.
Tom
Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety.
Benjamin Franklin, US author, diplomat, inventor, physicist, politician, & printer (1706 - 1790)
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