Well, you could go and buy one of every replacement tip size they have. Then you don't have to make another trip! j/k $5 huh? That's a lot more than the usual tolls around here. Fortunately, I have a Fry's about 20 minutes from my place.

Are you using 4S? My tires ballooned quite a bit on 4S, but nothing like they did on 6S! The Ofna belted slicks are kind of freaky as they don't balloon at all. They expand just a tiny bit, but that's it.