I measure 38 and have both 38s and 40s. I really don't feel a big comfort difference. The 40s are on my steel bike, which in general I find really cushy. Maybe the 40s are a little more stable. My other bike is alu and more twitchy. The bar width could be a factor.



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My shoulder are broad for my size (measure about a 38").

), but the 38 cm ITM Elle bars that came on my bike were definitely too narrow for me. Whenever I got tired, my wrists would break to the outside when I rode on the hoods.
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