Right, I'm switching to presta valves. I just went to the store to buy the rim adapter. I figure because the diameter of the valve is large, and the width of the tube is small, it's a lot easier to pull the tube out through the larger hole in the rim. I don't think that will be the case with presta valves. Besides, presta valves are very well built at the stem, so I don't have to worry about it again... someone mentioned that sun tubes suck? why? I'm on amazon purchasing a thorn proof tube, and the cheapest ones are avenir and sunlite