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  1. #1
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    Chain riding up on cog teeth.

    Hi Guys,

    I am running a 42T cog on a 1 x 10 setup. I am having issues with chain sporadically riding up on big 42t cog.

    any ideas?
    Attached Thumbnails Attached Thumbnails Chain riding up on cog teeth.-20151127_192427.jpg  

    Chain riding up on cog teeth.-20151127_192439.jpg  


  2. #2
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    What do you mean "riding up"? When does it do it?

  3. #3
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    It rides up on top of teeth.

  4. #4
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    When does it do it though, back pedaling, normal pedaling or???

  5. #5
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    Probably a worn (stretched) chain.

  6. #6
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    Chain is in spec. Cog showing some wear but it did it since new.

    It does it when shifting onto big cog.

  7. #7
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    After seeing the pics I'm going with the cog.

  8. #8
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    Was chain new when you put on the cog? That screams chain stretched. Unless you got a cog that was poorly machined (which is possible) and tooth spacing is way off, it looks like that chain is way stretched.

    Also as a side thought, is your cog one that has specific alignment for Shimano or sram cassette??? Shift ramps not being lined up correctly can do that too now that I think about it.

  9. #9
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    It seems as though teeth to spline relation is a little whacked. This could be.

    Chain was new, have measured now and still fits on.

  10. #10
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    Looks like you have a sram cassette, did you get the 42t cog made for sram or shimano?

  11. #11
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    Its a wolf tooth, they incorporate both s plines.

  12. #12
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    Wolf Tooth has a SRAM and Shimano specific cog. Double check that you have the right one for your cassette.

  13. #13
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    Its not "splines" its tooth ramp profile. If the shift ramps dont match properly, the chain wont shift right, causing the problem your having.

  14. #14
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    Hi RD, I ordered for sram but it does have positions marked for SR and SH.

    Tigris, ramps... teeth kinda seem out to lunch.

    Even when shifting to 2nd cog, it seems like they spring back a bit to land on cog.

  15. #15
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    If you look closely at the pic you can see that the chains pin position changes slightly with each successive tooth, losing more ground the further it goes on. To me that indicates a tight chain on a whooped cog.

  16. #16
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    Camera perspective, its actually on top of the teeth all the way.

  17. #17
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    I don't know, sure looks like it's gaining to me. Regardless the problem is a result of a mismatch, either the chain or the cog has to go, or both.

  18. #18
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    Actually one is going to gain if both are actually correct. Distance between each link is a fixed distance, so it will match the spacing of the teeth. It takes more chain to wrap the larger circumference of the tips of the teeth versus down where its supposed to be.

    Nothings been said about making sure the shift ramps are correctly lined up after it was asked. The chain isn't sitting as if the cog is wrong. The chain would drop in for part of it then ride up. This isn't droping in at all and obviously its been being ridden. So chain fits, its a bad shift matter. Not a bad part matter.

  19. #19
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    A photo with the chain completely engaged on the 42t cog would be useful.

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