I've got 44s which are right according to shoulder-width, but I think they feel too wide. Can't be arsed changing them, so I'll stick with it.
The biggest factor I found with handlebar width is that a wide bar bend your wrist inside a bit instead of resting your palm on the hood/bar.
@edscoble started
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The biggest factor I found with handlebar width is that a wide bar bend your wrist inside a bit instead of resting your palm on the hood/bar.