The growth of low-profile, run-flat and larger-rim-diameter tires over the past 20 years has raised the bar in terms of tire/wheel mounting and balancing and the types of equipment and amount of training needed to service them. According to data gathered by Hunter Engineering Co., tire/wheel service work that falls under these categories now accounts for 73 percent of the fitments on U.S. consumer vehicles, up from roughly 59 percent 10 years ago and 40 percent 15 years ago.
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