My understanding (which could be completely wrong) is that many of the sizing myths for handlebars have been debunked. And most simply prefer to go with the narrowest bar they feel comfortable with. I'm only 5'7 and have been on bars of 40cm cc for the longest time. Most bikes in my size range still come with bars of 42cc. Is this right or wrong who knows. I can tell you that when I built up my most recent bike I decided (against most thought process) to go up to a 42cm because I simply felt like I wanted more space to move around. I like it so far, I don't feel like I'm so open that my lungs are suffering or much of the other gobbledegook out there. Moral of the story, try some different options and see what feels best!