Licensed Bike Geek
Join Date: Oct 2002
Location: Los Barriles, Baja Sur, Mexico
Posts: 1,360
Bikes: Look 585, Kirk Terraplane, Serotta Ottrott, Spectrum Super Custom, Hampsten Carbon Leger Tournesol
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That approach won’t work properly as each ‘click’ of the shifter pulls a different amount of cable than a proper 9-speed shifter does. It will work sorta OK but it will grumble and make noises.
If your 10-speed bar end rear shifter has the D-ring on it, you can set your rear shifter to friction so it will shift correctly with virtually any cassette you can hang on your wheel.