I noticed I had a flat in one of my tires so I made a trip to the nearest shop to get air now my tire has a ring around it showing where it rubbed against the rim!
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Sidewall damages are most dangerous one. The tires weakest spot is Sidewall. If you drive with this tire at high speed it can start to wobble and pop out of nowhere. Since it won't be a tiny hole that will lose air gradually, but a serious pop you might lose control and crash. Just change the tire.