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Do you know in all my years of arsing around with bikes, it had never once occurred to me that road bars had a different std. diameter than mtb - suuppose i've never contemplated swapping the controls over before though!
Those drop-bar ends are probably the closest i'd get without some major changes to setup, but damn they are ugly & the shape looks a bit uninviting.
The surly corner bars look interesting but they cost a fortune, are heavy as shit and are 25.4m clamp so would need a shim...
Might dig out the On-one Geoff again & bar tape the entire thing, might give me enough options to take my mind off the wide 22.2 drop bar conundrum!
mcJ78
dadbike
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.