old tires have great tread.... on the surface they look good but they fail because they are hard and brittle
do not go by one thing.... consider both.... age AND miles...
I wonder how many unused spare wheels languishing untouched for years have old dangerous tyres.
Jay Leno has a Soviet Union built car a Volga I think & he was quite proud of its original made in USSR tyres. Since USSR disintegrated in 1991 if you see him coming turn off or stop.
