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What's the difference between a Sora, a Tiagra, and a Ultegra sets? Aside from DI2 and whatnot, is it only weight? I'm asking because I see people talk about "smooth shifting quality" and I don't really feel like my Tiagra is a piece of shit clunking along.
Are the brakes much better? Is it something in the bearings/BB? I just don't really see much of a reason for Ultegra to be as expensive as it is.