My Michelin LTX M/S tires still have about 1/4 inch tread depth, but they are 6 years old with a small amount of cracking on the sidewalls. Truck is always garaged except when on the road. When towi...
Michelin recommends a demounted inspection at five years, and I think at more frequent intervals after that. It's felt that condition is best assessed from the inside out. Hopefully they'd give you an honest answer as to whether or not yours need replacement.