No, the diameter of this bar where your brake and shift levers would mount is 15/16", like any road handlebar, and that is bigger than the diameter where the brakes/shifters mount of a mountain bike handlebar, which is 7/8". Your mountain bike stem, assuming it fits 31.8mm clamp diameter bars, would still work with this bar. So, if you want to use this drop bar with a mountain bike, you would need to buy different brake levers and shifters.
A not very good alternative is to get the Soma Gator drop bar; a portion of the drops (the last 160mm of each end of the bar) is 7/8" and would fit mtn shifters and brake levers, but doing this would relegate you to riding primarily in the drops.
Date published: 2018-01-21