Chain rubbing on derailleur cage

Rowan404
Rowan404 Posts: 104
edited May 2018 in MTB workshop & tech
Hi, I got a new slx 1x11 groupset for my Scott genius and I'm having problems with the chain rubbing on the derailleur cage. This rubbing makes it so my 1st gear requires the same amount of power as the 2nd gear rendering it useless. I've tried fiddling with the b screw and no adjustment seems to prevent this. I'm pretty sure the chain is threaded correctly and that the length is correct. Here is a link to a video of it https://youtu.be/cmoWwZhnde4

Comments

  • cobba
    cobba Posts: 282
    edited May 2018
    Rowan404 wrote:
    I'm pretty sure the chain is threaded correctly

    Looking at that video, I don't it is.

    The chain should run in a straight line between the 2 jockey wheels and shouldn't be rubbing on any part of the cage.

    When the chain runs in a straight line between the 2 jockey wheels, you can see it out the back of the cage.
    https://youtu.be/K_2JNVa6SC0?t=111

    Your chain looks to he hooked up in the cage.
  • 02gf74
    02gf74 Posts: 1,171
    Shimano and possibley sram derailleurs have a tab between the two jockey wheels, it is very easy to thread the chain incorrectly so it rubs on the tab.

    In the second video, the chain is much too long.
  • Rowan404
    Rowan404 Posts: 104
    Right. I think I see my mistake now. Thanks for the help.
  • 02gf74
    02gf74 Posts: 1,171
    What was it?
  • Rowan404
    Rowan404 Posts: 104
    I think it was partly the improper chain threading although now that my chain is correctly threaded I am still having the issue just not as bad as before.
  • supafly1982
    supafly1982 Posts: 631
    If you have still not sorted it why not try this, Once chain is correctly routed make sure your B adjustment screw is adjusted to give the jockey wheel sufficient clearance from the cassette, otherwise you will prematurely wear out the top jockey wheel.

    Is the derailleur new or used?

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