Does Tire Patching Always Damage the Rim Edge?
2 Answers
Under normal circumstances, the rim will not be damaged during tire patching, which depends on whether the tire changer is functioning properly. Some tire changers may cause rim scratches if there are gaps. There are four common methods for car tire repair, such as using rubber strips for patching, which is the earliest and most traditional method. Simply take a large rubber strip and insert it into the punctured hole in your tire, preventing air leakage. Another method is using mushroom plugs for tire repair. These mushroom plugs somewhat resemble thumbtacks or what we call push pins, with a flat base that is quite similar to a patch. Alternatively, there's cold patching, which requires removing the tire from the rim (or wheel). A layer can be ground off like this, and then a new patch is applied on top.
I used to work in an auto repair shop for several years, and it's true that tire repairs can sometimes scuff the wheel rim edges. The main issue occurs when removing the tire with pry bars – if the technician is inexperienced or uses improper tools, the metal tip can directly press against the rim edge, leaving scratches. Better shops use plastic protective sleeves on the pry bar tips, and their tire removal machines are automated, which basically prevents contact with the rims. However, at small roadside shops using old-fashioned manual tire removal methods, improper operation can easily scratch the wheels. I recommend keeping an eye on the process during tire repairs, especially for aluminum alloy rims which are particularly prone to scratches – if you see the technician applying too much force, remind them. After completion, remember to inspect the rim edges; if there are fresh scratches, have the shop address them immediately. Actually, skilled technicians work very gently and won't even touch the seam between the rim and tire.
