That brings up an interesting question in that the local bike shop apparently gave me the incorrect tube size. I run 700x23 and was given a tube that fits 700 18/25 (according to the box). When I installed the tube in my tire, there was a few inches of spare innner tube that I had to figure out how to stuff in the rim. When I inflated it, it blew when I reached 120 pounds even after taking considerable care to assure there was no tube under the bead. Is the aforementioned tube appropriate for a 700 x 23? Another bike shop this morning told me it was too big, and if that is so, why does it specify that it fits the range of tire sizes mentioned. I would sure like to clarify these things to avoid making mistakes in tube selection.