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It's unfortunately more complicated than just finding a 2x9 shifter. Pull ratios (the distance a cable has to "move" to shift from one gear to another) are different on road and mountain bikes groupsets (Acera is in the MTB range). Assuming you'd find a 2x9 with hydraulic brakes, they won't be directly compatible. There are adapters, but from what ...


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I think you are out of luck there. There are expensive cable to hydraulic converters available. You could get (equally expensive) 10 speed hydraulic brifters and use a 10 speed to 9 speed cable pull converter. This should work with your existing drivetain (you’d have an "empty" 10th gear). But all of that would be a hack. Is the frame even short ...


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