I think a lot depends on how bad the bubble is. Some bubbles are hardly noticable, even if your looking, these I wouldn't worry about too bad. I'd be willing to bet most of us have slight bubbles because it's impossible not to. Eventually your going to hit a pot hole or two. If theres one bubble and its not huge, I'd just keep it. Your gonna spend a ton of money replacing tires if you do it for every single bubble. If you look you'll surely find those barely noticable ones I speak of.