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@Simon
I need to move my crank chainline out by 2mm (from 46mm to 48mm).
I currently have a 113mm BB, so I was about to order a 115mm one. Then it suddenly occurred to me that this will only move the chainline by 1mm because chainline measurements only involve HALF the axle length.
Am I right? To change the chainline by 2mm do I need to buy a 4mm bigger BB?
Brain ache...