Here’s a quick look at some of the most common tyre injuries and repairs
A spot repair is needed when damage is to:
- the rubber only of a tyre
- the rubber and minimal damage has been done to chafer plies, protector plies, and some plies in a belt
- the rubber and less than 25% of actual body plies in a bias tyre.
When the structural integrity of the tire has not been affected, a spot repair can be performed, by removing the damaged material and replacing the rubber with either chemical or heat curing rubber.
When more than 25%, but less than 75% of actual body plies in a bias tyre have been damaged; a reinforcing repair unit (patch) is required. The patch is smaller with less reinforcing material than would be required for more extensive damage.
When the damage is to just some of the working plies in the belt of a radial tyre, the area may require some reinforcement from a patch.
When the damage is to more than 75% of actual body plies in a bias tyre; a “full section” repair must be performed. This will require the use of a larger patch, with more ply strength, than in a reinforcement.
Radial tyres have only one body ply – regardless of the ply rating of the tyre. Therefore if one – or more – of these cables are broken or rusted, they must be removed and a patch must be installed to provide the structural strength, and air-tight integrity that was lost to the damage.