Interesting observation today: I rode in a Dallas area ride - the "Red Hot Chili Pepper". There was a 60, 40 and 20 mile ride. Not sure but I'm guessing in the 60 mile ride, there was about 150 to 200 registered riders. Other than 3 or 4 mountain bikes in the shorter rides, I did not see one single bike that was a cyclocross or even a hybrid. I felt a little out of place on my Tricross. Anyway, this made me start really thinking about tires sizes and chainrings... Anybody want to give me a quick education on this subject? Thanks!