Why should I pay extra to properly repair a flat tire when plugging is so much cheaper?
Unless you have x-ray vision, any damage on the inside of the tire cannot be detected when plugging the tire on the rim. By removing the tire from the rim, inspecting the interior, and repairing the damage with a rubber stem and a repair unit, the integrity of the tire can be restored or potential problems can be identified. Proper tire repair also protects the casing, so the tire can either be retreaded or returned for credit.