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I'm replacing old parts on my commuter because I've ground everything to dust. I just learned from my LBS that my STI 5600 triple shifters are trash too, so now I'm confronted with having to find identical 105 shifters which will be a costly and timely burden. Does anyone know whether a 2x10 shifter pair would be fine with a 3x10 drivetrain? My commuter's original drivetrain is a 3x10 with a long cage Ultegra rear, triple Ultegra front deraillir, and a new triple crank.