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Got A Stumper.

Discussion in 'The Shop' started by rideit, Mar 5, 2019.

  1. rideit

    rideit Bob the Builder

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    So, I owned a shop for ten years, and worked as a wrench for 20. I have worked on thousands of bikes...I have a brand new Cassette, Chain, and chainrings (9 speed, 11-32). Skips like a son of a bitch in ONLY the 11 tooth cog.
    Try it Nao has been...tried.
    Derailleur bscrew is perfect, spring is good (was working perfectly with the worn out cassette and chain).
    Anyone?
    CX bike.
     
    #1 -   Mar 5, 2019

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  2. Jm_

    Jm_ Turbo Monkey

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    How's the actual b-tension spring? Possible something in the derailleur fractured/broke when you changed it (because it was already on it's way to breaking)? I remember those old SRAM b-tension rings would break.
     
    #2 -   Mar 6, 2019
  3. 4130biker

    4130biker PM me about Tantrum Cycles!

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    Is the upper derailleur pulley parallel to the cogs (eyeballing it from the back)? Maybe a tweaked derailleur hanger with nice new teeth is catching where the worn setup didn’t.
     
    #3 -   Mar 6, 2019
  4. Nick

    Nick My name is Nick

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    behind you, don't wait up.
    Shoot.

    I can't help you.
     
    #4 -   Mar 6, 2019
  5. Westy

    Westy the teste

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    Try it meow?
     
    #5 -   Mar 6, 2019
  6. rideit

    rideit Bob the Builder

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    Yes, alignment is perfect.
     
    #6 -   Mar 6, 2019
  7. Westy

    Westy the teste

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    Wrong spacer?

    Needs Moar shimz?
     
    #7 -   Mar 6, 2019
  8. canadmos

    canadmos Mater Slayer

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    Try it meow......with beer?


    You say new stuff. Maybe one of the new items is the problem. Stiff link in the chain or a bent tooth on the cassette?
     
    #8 -   Mar 6, 2019
  9. StiHacka

    StiHacka Compensating for something

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    Correct chain? Which way is it skipping?
     
    #9 -   Mar 6, 2019
  10. 4130biker

    4130biker PM me about Tantrum Cycles!

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    Skip it nao !
     
  11. rideit

    rideit Bob the Builder

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    Correct chain, new cassette, new chainrings. No stiff link, only skips in the 11, no bent cogs.
    It skips over the cogs like a new chain on a worn cassette or vice-versa.
    There are no spacers.
    Looks flexy
     
  12. StiHacka

    StiHacka Compensating for something

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    Does it skip under load, too?
     
  13. Nick

    Nick My name is Nick

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    1x ring up front or 2x?

    if 1x, maybe the CL if off my a few mm. Is the front ring flipped?
     
  14. OGRipper

    OGRipper Turbo Monkey

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    What brand(s) are we talking about?

    Process of elimination: Try a different 11 tooth cog from a different cassette, even an old one. The skipper could have been dropped or crushed or something.

    If that doesn't work sounds like a chainline/spacing issue of some kind. What frame, crank, BB, and hub? Spacing all kosher?
     
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  15. rideit

    rideit Bob the Builder

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    Everything has worked flawlessly on this rig for around 20 years, no spacing issues.
    Ultegra 9 triple, chain line is perfect. XT derailleur.
    It was doing the same thing when I tried a new chain on the old cassette, (only in the smallest cog) so *maybe* the derailleur, but it works PERFECTLY with the old chain and old cassette, which would be odd...
     
  16. Westy

    Westy the teste

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    Skipping is more efficient in low gravity, perhaps this is just your moon gear.
     
  17. Jm_

    Jm_ Turbo Monkey

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    If it's the derailleur, what do I win?
     
  18. rideit

    rideit Bob the Builder

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    The old derailleur.
    You pay shipping.
     
  19. OGRipper

    OGRipper Turbo Monkey

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    Smells like there is something just off enough to show up with a new chain, but that didn't show up with the extra slop of your old chain.

    How old is the derailleur? Pulleys ok?

    Wait, it's a triple? You better ask Lennard Zinn. :banana:
     
  20. rideit

    rideit Bob the Builder

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    The derailleur is ~18 years old, I am trying a new one tonight. Tough to find a decent 9 speed derailleur at the last moment...
     
  21. Westy

    Westy the teste

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    It probably has EbolAIDs
     
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  22. rideit

    rideit Bob the Builder

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    Well, figured out the problem, JM doesn’t get a derailleur. Turns out I accidentally installed a 12 tooth lock ring, so the chain wouldn’t mesh on the teeth.
    Doh.
     
    #22 -   Mar 6, 2019
    Last edited: Mar 7, 2019
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  23. Nick

    Nick My name is Nick

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  24. Westy

    Westy the teste

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    Frickin' Noob
     
  25. rideit

    rideit Bob the Builder

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    Pretty much correct.
     
  26. rockofullr

    rockofullr confused

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    Good luck. I did the bike shop scavenger hunt for a 9spd a few months ago. Took quite a bit of calling.

    I need to refresh threads before commenting :busted:
     
  27. Jm_

    Jm_ Turbo Monkey

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    Ya'll don't have bike swaps on your part of the flat Earth?

    Cheap 10 and 9spd stuff (for my commuting drivetrain) forever!
     
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  28. OGRipper

    OGRipper Turbo Monkey

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    Doesn't really explain why it did it with the new chain and old cassette, but ok then.
     
  29. rideit

    rideit Bob the Builder

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    The old cassette was 12-27, the new one is 11-32. Hence the accidental lock ring swap.
     
  30. StiHacka

    StiHacka Compensating for something

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    Technically it isn't a 12sp lockring. :D
     
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