I've purchased quite a few road tires for my Jamis, but I've had my Trek fx since Oct. and just had my first flat. The tire says 700 by 34c, so my son stopped at my lbs, (where he goes to school) with a note saying that I needed 700 by 34 tubes. Well, when I got home there were the 700 by 28-32c tubes that I usually get for my road bike. I thought he made a mistake so I emailed him and he assured me that this was the tire he uses on all bikes and it would go up to 34c no problem. I installed the tire, pumped it up and while I was putting the rear wheel back on, it exploded. And of course I had my face right next to it! I emailed him and asked him about it (after my hearing returned) and he said I must have seated it wrong on the rim. It was not the tube. I've gone to this lbs for several years, and have never had anything but great service.

Opinions? Is this what people normally get for 34c tubes? Why won't he just sell me the correct size? Just want to hear what you guys think...