I just bought a used mongoose rockadile al from a friend of mine. I'm new to bikes and know that it's a cheap starter bike, but I only gave him $35 for it, so it's all good. My question is that it's making a clicking noise from where the chain is rubbing the derailer in both the 1rst and 3rd gear sets while riding. Is this normal, and if not what is the problem. It has a cheap Shimano derailer, etc. I haven't had a chance to try and adjust it.
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