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Discussion Starter · #1 ·
i just got an LX m581 front derailleur. i know it is an older model and 9 spd compatible. would it be wrong if i run it with a 10 spd in the back? will i encounter any difficulties when ill tune it? i mostly use the large and the middle ring in front... rarely, when i do climbs i use the small one. also at the back, i keep it in the middle most of the time. any opinions?
 

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since 4/10/2009
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a 9spd shimano derailleur will NOT work on a 10spd cassette with 10spd mtn shifters. the cable pull ratios are different for 9spd mtn and 10spd mtn (Dyna-Sys) stuff. 9spd mtn and 10spd ROAD are the same, so if you used some 105 or Ultegra 10spd drop bar shifters, you could use that derailleur on a 10spd cassette. but that's getting complicated.
 
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