I run 'em to failure and extract the last possible mile. Sometimes that means blowouts and flats. Sometimes I deem the tire a good candidate for getting a tube if the tread is still deep. Never has it caused anything worse than a minor inconvenience.
I'll have to look for a date code on the wide whites the '59 wears in the spring when I get it out- they have to be 20 years old and their gonna stay on there until they physically can't.
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