i was riding home today from work and i hear this small chattering noise when riding next to the center curb on the left lane. i stop to check and seems like the on top section of chain, inner side of the chain is rubbing the plastic piece. Does this mean that the chain is loose? also i put around 650mi on it and i bought it brand new. what can happen if the chain is loose like that. i want to do the 600mi inspection but getting pay next week. please advise thanks.