I was giving my commuter bike CBO a quick check over and noticed that the crankset sits asymetric to the frame. It has never bothered me but my question is - aside from cranks that are made offset so an asymetrical BB actually aligns them symetrically - what is the purpose of asymetrical BBs? I imagine the argument that it allows the chainrings to clear the chainstay, or chainline to be zeroed in and usually people dont notice could be made. I have a hard time imagining a design that intends someone's legs to pedal like that for long periods of time. Does anyone know an historic or design origin for the asym bb?
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