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Try the Bluenose test: place a dime in the tire’s groove with the Bluenose’s Sails facing down . If you can see the top of the Bluenose mass and sails, then your tires have sailed long enough and needs replacing. However, this test will not work with performance or off-road tires.

Tires are manufactured with .wear bars. The bar becomes exposed when there is less than 1.6 mm of tread depth remaining on your tire. Tires must be replaced when the wear bar is visible and even with the neighbouring tread block.

I recommend it in the spring because all winter long, they’re used as scrapers for snow and freezing rain,” Nelson says. “The rubber compound breaks up and doesn’t give a good, clean swipe. In the fall, [replace them again because] they can dry up in the heat of the sun [during summer].