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6-3. Do-it-yourself maintenance
When to replace your vehicle's tires
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Tires should be replaced if:
The treadwear indicators are showing on a tire.
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You have tire damage such as cuts, splits, cracks deep enough to expose
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the fabric, and bulges indicating internal damage.
A tire goes flat repeatedly or cannot be properly repaired due to the size or
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location of a cut or other damage.
If you are not sure, consult with your Toyota dealer.
Tire life
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Any tire over 6 years old must be checked by a qualified technician even if it
has seldom or never been used or damage is not obvious.
If the tread on snow tires wears down below 4 mm (0.16 in.)
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The effectiveness of the tires as snow tires is lost.