Bike Forums - View Single Post - How do I Attach Thumb Shifter to Drop Bar

06-01-13, 05:46 PM

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Retro Grouch

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Quote:

Originally Posted by TallRider

Note that flat bars have a 22.2mm diameter on most of the bar (with 25.4mm or 31.8mm on the clamp area).
Drop road bars have 23.8mm clamp section on the non-clamp part of the bar.
So your mtb shifters on the current flat bar have a 22.2mm clamp diameter.
You can get a road bar with 25.4mm clamp diameter (and it will fit on the current stem) but taht won't take care of your shifter problem.

It's been awhile but I've seen drop bar brake levers with clamps that only fit the smaller bar diameter. Somewhere there's a handlebar that fits those levers.

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