Almost 99.9 percent of the time if you get a nail in the side wall your tire is pretty much done. Even if your not losing air it's definetly a safety issue... I bought new tires for my range rover and literally 2 days later with only 150 miles on the tire I got a screw on the side wall... Yea I was pissed but nothing i can do you have to replace it. Sucks cuz I have 24's the the tires are expensive ass hell!! Anyways done and over with but yea definetly needs to be changed