I measure 38 and ride 40 on one bike and I think the other is 38. I was told the 40'd give me some breathing room. Both feel fine for me.
........ Hmm.. maybe the 40s feel a tad more comfortable though but that could be due to various other factors too (diff bars, campy vs shimano, diff bike, etc.)
Occurs to me that you might want to know the bars: Ritchey BioMax (38) and 3T Ergonova Pro (40).



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Several of you mentioned you ride both [widths], do you think I should run with 38s? Or would 40s be a better/worse option, esp. for climbing?