• How do you mean noisy BB? Might just need tightening or removal and re-grease?

    -edit- I very much doubt anything is wrong with the BB, Shimano are generally very good quality and even a poorly-fitted BB will not make noise per-say. It is the movement of the whole against the BB shell and not the spinning action of the axle.

    Looks like you have bought a 1/8 sprocket and consequently your chain, being smaller gauge wont fit.

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