I just ordered new sprockets and a chain - a 520 heavy duty standard (don't know which brand). What exactly does the 520 designate? I didn't specify any length. Was this a mistake? Are chains bike specific? Will it be long enough that I can remove links if necessary. I increased my rear sprocket size from 48 to 50 and kept the front at 13. I'm not sure what the stock sprocket sizes are.
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