I had just gotten my 700xx and was about 20 minutes into my first ride and me and my buddies pulled to the top of the hill to check out the view and noticed my right rear tire was nearly flat. It turnes out a rock had punctured about a 3/4 cut into my sidewall. After looking around for tires and not wanting to spend another $200 on a brand new bike for new tires I decided to try and convert it over to a tube. We have 10" tubes at my work that we discard with each tire change so I figured I'de give it a chance even though the tube is slightly smaller then the wheel diameter on my 700XX. At most since the tube was free it would cost me the valve stem I had to cut off. I also had to put a patch on the inside of the tire because when I first broke the bead a ton of sand had been pushed into the tire thru the cut. Anyways the tube stretched over the wheel just fine and after cramming it into the tire cavity I inflated it, then deflated it and finally reinflated it in an attempt to work out any folds that may have been in the tube. After about a 5 hour test run yesterday it held up great and I am extreemly happy with it. Just keep in mind if you do it, when you first inflate the tube you are going to have air trapped in pockets between the tube and the tire so for quite a while there will be air leaking out of the tire which is normal. Even after it sitting for 5 days and 1/2 hour into my ride some more trapped air must have shifted and finished leaking out, but after a little bit it was all out also. This is just an idea for the tight wads like myself or the guys who maybe have multiple plugs in their tires and don't want to spend the money for new ones even though the stock Dunlops are a POS!