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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There are a variety of 10-speed Shimano shifters available through different sources that would work perfectly with what you have now: 105 5600/5700, Ultegra 6600/6700 and Dura Ace 7800. You may have to search a bit but they’re out there.