I replaced my five-year-old, all season, Michelin 'harmony' tires with four new, all season, Michelin 'defender T+H' tires last month. Checked before tires put on for the DOT on all 4 tires, clearly indicated month & year tires manufactured. I wanted tires manufactured in Canada, not the U.S.A. November 2017, driving in -4 temperatures, salted roads were melting and freezing again. Traffic was crawling at 45 miles/hr. over patches of black ice. I credit these tires for keeping me on the road that day. However, these tires should not replace winter tires. Excellent tire & braking grip on the road. Quiet ride. Will update after a year.
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Tires are usually taken for granted, until the road puts them to the test.