I bought this frame and have no idea what type of derailleur was on it. I have the back wheel and it has 8 gears. I feel this is a legitimate question and none of the other similar questions answered my question. Please don't close this question I really need help with this. Is there one I can use that is held on by the axle? The question that was identified as a duplicate did not show which type of hanger or where I could buy one.