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The primary issue is difference in bar diameter. MTB controls are manufactured for 22.2 bars, whereas road bars use a 23.0mm diameter. There are a few niche drop bars that are made in 22.2, and I’ve seen folks do some machining/fabricating to fit the controls, but that’s out of my scope expertise.
You could do cross top levers and Paul thumbies to get the shifters and brakes up top on those without all that hassle, but then component choices are somewhat limited.
The final and likely less desirable option is a standard flat bar and some of the drop bar bar-ends mounted. SJS Cycles lists a few different brands of these, intended to afford a drops position on standard flat bars. They look pretty odd though if that matters.
Why isn't there more bars & bar chat in here? Is there another bars thread i'm missing?
Anyway - has anyone ever mounted mtb style brakes & shifters to a wide graveaux-style flared drop bar? Is this a stupid idea that only makes sense to me?
Thinking of using something like the Ritchey Venturemax like a flat hybrid style bar with the controls on top but with the option of drops... have a bike currently set up 1x10 with mtb hydros but it used to have drops & I kinda miss that but cba swapping the brakes etc. over