A few teeth on my rear gears are bent and I need to get it replaced. I was wondering how hard this will be. The bike shop quoted me at $60 installed. I also need a new chain so thats even more. Anyway I was thinking I could save some money doing this my self. One more question so I don't have to start a new thread. There is no "clicking" sound coming from the rear when pedaling backwards or just coasting. Is that normal or should I replace that also?