Chain Rub
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Chain Rub
I have a bike with LX bottom pull front derraileur, LX crankset with outboard bb bearings, 44-32-22 Raceface chainrings, xt rapidfire index shifters and SRAM 9 speed chain. No matter how I adjust it, I can never have it so the chain does not rub when on the middle chainring and largest cog on the cassette and large chainring and smallest cog on the cassette. I do it exactly according to the instructions on the Park website, 2 mm of clearance between the large chainring and cage and with the cage parallel to the chain in the top gear (large chainring, smallest cassette cog). I replaced the cable and housing for the front derrailleur recently and the chainline is good. No matter how I micro-adjust the cable tension, it is impossible to have the bike shift smoothly from middle to big chainring without having the chain rub on the largest cassette cog and middle chainring, plus it still rubs on the highest gear, too. A little chain rub is no big deal but this is considerable rub and still the 32 to 44 tooth shift is never all that smooth. It seems to kind of double-clutch before engaging the big chainring. Does anyone have a workaround? I was thinking narrower chain or wider derrailleur cage but those are pretty much standard widths, AFIK. Any advice is much appreciated.