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BMC bottom bracket replacement.

I have now ungraded many parts on my bike with help of this forum now to the next problem. My bottom bracket on my bike creaks a lot so I wish to replace it. It has the following info on it - SM-BB5700 - BC1.37 X 24 ROAD. I cannot find a replacement if I type into wiggle etc it comes up with a ultergra part. Can anybody advice of correct part and what tools needed please. I have attached a couple of photos for you assistance.


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