When the belt breaks, an "egg" can form that will thump. The tire is probably (very) near the end. Better to retire ( ) it now before it decides to take out a rim or fender (or worse).

Scott B. "I'm a self-made man... I started with nothing, and I still have most of it!" 68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph 69 340 GTS stock 14.18@ 95.60 mph 01 5.9L Ram 1500 Quad Cab 4x4 01 3.5L 300M 16.23@ 86.97 mph