Michelin recommends yearly inspections after 5 years and replacement at 10 years for their entire line. They have a detailed write up here:
https://www.michelinman.com/US/en/help/do-I-need-new-tires.htmlOur C rides on commercial grade all-steel cased Bridgestone Duravis tires and are about 5.5 years old. Not sure how long we will keep them, perhaps 8 years. Looking at the Bridgestone Duravis R238 as a replacement when the day comes.
Had the tires inspected and had one dismounted while looking for a slow leak. Perfect condition inside and out (suspect TPMS sensor for slow leak).