■Rubber type

• The repair method is simple, but doesn't take the fact that once stretched rubber returns to its original size. As a result, it is possible that the plug can pop out to either inside or outside.
• The plastic tool used to aid insertion remains inside the tire, and can damage the inner liner.
• When inserting the plug, it can catch on one of the steel cords and tear. Such loss is common, and results in increased expense.

■Cord type

• Insertion is extremely difficult without expanding the hole to at least 6 mm, damaging the tire excessively.
• During insertion, the steel cords can catch on the tool and damage it.
• As time passes and the cord deteriorates, leakage will recur.
• The adhesive type sticks to your fingers, with poor work efficiency.

• The amount of filler material reaching the inner lined varies widely depending on the user, producing different results.
• When fixing from the outside, leaving excessive material on the surface of the tire can result in the plug being pulled out. If excess material is left on the inside, it can whip back and forth during car motion, damaging the tire (test data provide by Bridgestone Engineering Department).
• Even for a small-diameter nail hole, the diameter must be widened to repair, further damaging the tire.
• There are no definitions as to what types and sizes or tire damage may be repaired with this method, presenting a legal (product liability) problem. (No safety standards are listed in the product literature.)