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@rpm
Mountain bike bars are getting wider and wider these days. Most of what happens with mtb gear is trend related.
Another answer as to why I have 42s is that the cinelli chromo bars that I have don't come in any other size!
I can't see there being a huge aerodynamic difference unless you have narrow shoulders (actually many top sprinters do, look at jamie staff and jason kenny FI) maybe it's a control issue? narrower bars wil give less leverage which should mean they are harder to turn at high speeds which= good for track.