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As long as the puncture is less than 3/8" in diameter, well into the tread area (not near the sidewall) and no belts are plys are damaged, a plug and patch combo should hold up very well. Be sure to monitor Psi on the tire a bit more than normal for the first month or so.

 

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Is this DIY or it has to be taken to a shop? I have a friend that just puts plugs in his tires and never had a problem.

Best way is both plug and patch which should require dismounting the tire from the wheel. This normally requires a shop.