I rode a 1971 Honda CB350 200 miles on the original tires when they were 40 years old in 2011. Personally I think the old natural rubber was better. Seen Michelins dry rotted about the same in 6 years and no recourse from Michelin, WITH 90% OF THE TREAD LEFT.
I did ride very carefully, never above 45 mph and always sensitive to any change in ride quality.
regards
mech
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