is the tire properly mounted? you could either have a spot where the tire is not seated all the way into the rim or seated too far. depending on how old the tire is it could be a few broken cords
__________________
“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk