[doowopper]

thanks for the suggestions. i inspected the rims and there isn't one weight on either, inside or out. this is my around town beater until i get my '69 back in service so i usually put take offs on it. i'd guess they are a couple years old. i've had a couple car tires over the years that started to separate and it was visible. probably these larger truck tires are stiff enough to hold together better. i'll keep checking.