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Here you go! http://www.sheldonbrown.com Ignore how ugly the site is, there is some great info on there. For me, what helped really understanding my bike was that I had to take it apart, ship it, and put it all back together for an internship. If you happen to have a junky old bike sitting around, or could borrow one from a friend, I would definitely recommend trying to take one apart completely to try and understand why everything does what it does.