My Aunt bought a 1966 Cadillac new and it wore out the factory bias ply tires in 6000 miles. She replaced them with Michelin X tires and drove it on them until it had 70,000 miles. She replaced them because they were 13 years old and dry rotting, not worn out.
You couldn't get me to drive a car on bias play tires. I even put radials on my 37 Ford, and promptly lost a hubcap going around a turn a little too fast.
regards
Mech
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