Yesterday morning I flatted not once, but TWICE (was only carrying one spare tube)! In general, I sure have been flatting a lot, especially recently and wanted to see what you all thought of Specialized Mondo Pro II Tires? They're almost new and I don't have any impression of them either positive or negative other than I keep getting flats. Rear tire every time, never the front. Several times I could not find any puncture through the tire itself. A few times though I had sharp rock / gravel that punctured through the tire. Could be the other times this is also what happened but the offending debris fell out before I found it. Or maybe I'm getting pinch flats? I have no idea. I generally don't waste time inspecting the old tube, rather focusing on the tire and making sure nothing is left that is going to puncture the new tube. I inflate to 125 psi rear 120 psi front. Is this not a good tire? Are there other tires that are significantly tougher? Why do I always flat on the rear and never on the front? My guess is because the rear is carrying more of the load?