Hey guys, my grandfather was big into the classic bicycle and scooter scene but unfortunately passed a number of years ago. I have 8 20x1.75 tires that he left behind that I know nothing about. 4 whitewall U.S. Royal Chain and 4 blackwall Uniroyal Chain tires. The whitewalls have some light cracking in places and the blackwalls have none that can be seen. I have no need for them and hope they could go to a good home, but I am curious as to their approximate age and worth. Thanks for the help.