(BPT) - New research found Americans are strategic about car maintenance, including when it comes time to replace their tires. Hankook Tire's latest Gauge Index Survey found 4 in 10 U.S. drivers replace their tires on a regular schedule, while 5 in 10 replace only when necessary, and 1 in 10 wait for a rebate or promotion.

Trust your eyes, or someone else's

Most Americans don't hurry to buy new tires, with more than half (55%) of respondents saying they only purchase tires when they have no other option, like a flat that can't be repaired. But if the tires are still rolling, how do you know when it's time to replace them?

For many drivers, the "eye test" is all they need: one-quarter (25%) said visible damage is the main reason they would spring for a new set of tires such as tread that

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