i am a new rider. my nephew got into it with me. i bought a 2004 trek 1000, and he bought an old trek (not sure which model). i was going to upgrade all my sora parts to dura ace, giving all the sora compnents to my nephew, eventually buying a carbon frame and he eventually getting the complete trek 1000. looking through Derailleurs i found band on and braze on. i do not know what either of these are. im hoping someone could tell me what i need, as well as a place to get them at a good price, thanks in advance, Nick