Back when we were young, stupid and poor I plugged tires and rode them till they were slick. Never had one of those sticky string one's fail. I did have the rubber kind fail. I once plugged the tread edge of a sidewall. Finally took about 4 plugs to stop leaking. Got me home before it finally leaked too fast to go anymore. These days I tend to just replace the tire if it's halfway to worn out. But, this tire still has a lot of tread on it. Heck, when I was young and much crazier than I am now I plugged a front tire on a Gold Wing and rode it 1000 miles home. That was stupid.. But, it did the trick.