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I just look for the wear bars on the tires. When they are showing at tread depth, it is time to replace them. I don't think I have ever measured tread depth. It is a pretty simple visual inspection. Like knowing it the tire looks like it low on air pressure.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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