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Plugging a tire from the outside is a temporary fix at best. Sometimes it can cause the tire to seperate & it always lowers the high speed capabilities. The tire should always be patched from the inside but this still lowers the speed rating of the tire like any puncture, that being said there are interior patches with integral plugs for larger holes & I don't know how much they lower the speed rating. Sidewall puntures cannot be repaired because the sidewall is constantly flexing & helps support the weight of the car
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