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rear derailleur

Discussion in 'The Shop' started by Sshields32, Mar 11, 2008.

  1. Sshields32

    Sshields32 Monkey

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    I bought a Sram x.9 rear derailer and I put it on and it was working great, shifting like i wanted it to. But i bought a new x.9 front derailer and now my rear derailer is shifting like its a 10 speed, but i run a 9 speed cassette.
    What should i do? I dont know what i did to the derailer to make it start shifting differently, If i did anything.

    Edit: Should i have put this in the tech forum?
     

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  2. HAB

    HAB Chelsea from Seattle

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    The front derailleur should have absolutly nothing to do with the rear.


    When you say "shifting like a ten speed," what exactly do you mean? Is the indexing off, so that it dosn't line up with the cassette cogs? Or does it just shift like poo?
     
  3. Sshields32

    Sshields32 Monkey

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    Well, i run a nine speed and my rear derailleur is shifting like a ten speed.
    It doesnt line up right with the cogs.
    Should i just adjust the high limit screw?
     
  4. DownCycles_Stef

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    If you put a new shifter cable on with the new rear derailleur, what probably happened is that the cable just stretched out a bit. The fact that it happened at the same time as the front derailleur is likely just a coincidence. All you need to do is re-tension your cable either by using the barrel adjusters or by unscrewing the cable, tensioning it, then re-clamping it. Keep in mind, that nearly every problem with shifting can be fixed by doing four things.

    1) Take off derailleur and check hanger alignment (usually not the cause unless problem showed up after a fall, so in your case, don't worry about this)

    2) Align upper limit screw (or lower on a rapid-rise derailleur) so that upper pulley wheel is in line with the smallest (or biggest for rapid-rise) cog.

    3) Tension and tighten down shift cable while in the lowest-tension gear.

    4) Shift into the highest tension gear and adjust lower limit screw (or upper limit screw for rapid-rise) and adjust the B-Limit screw so that the upper pulley wheel is in line with the biggest cog (or smallest cog for rapid-rise) and is as close as possible for shimano derailleurs (5mm away from cog for SRAM stuff).

    -Stef
     
  5. w00dy

    w00dy In heaven there is no beer

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    I'm with Stef, check your cable tension before you touch anything else.
     
  6. Sshields32

    Sshields32 Monkey

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    Thanks a lot for the help. I checked the cable tension and it was pretty tight so i just completely redid the derailleur and now it works perfectly.
    Thanks again!