The underlying cause of a bubble in the side of a tire is a separation between the cords and plies in the body of the tire. The damage to the plies allows air to seep through and form a bubble in the flexible rubber outer layer of the tire.
May 7, 2013 at 12:43 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.