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  1. #1
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    I just replaced the chain, crankset,rear derailleur and cassette on my mountain bike yesterday. I also put on a new housing and cable for rear derailleur. This morning i took it our for a 25 mile spin. Everything went fine except for on 3 or 4 different occasions I had what i believe to be chain skip. It felt like the rear der. was auto shifting but the chain was on the proper cog to coincide with the gear shifter. ( i don't think it actually shifted)

    I have checked for a tight link and have found none. I have also fiddled with the der. tension. Considering the fact that the symptom is sporatic, I am unsure if i have cured it. In the stand the bike shifts fine. I even hooked it to the trainer so i could test it under load. Everything was fine.

    Anyone have any ideas of what i could be missing?

  2. #2
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    bump.

  3. #3
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    Sounds like it could be the freehub slipping, pawls not engaging or slipping cuase the grease is too thick. Was it cold when you were out, slipping in the lowest gears? Usually its a winter thing, but i cant think of what else it would be with new everything.

  4. #4
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    Sounds like cable tension isn't properly adjusted. See if you can play with the barrel adjuster on the rear der, or maybe at the shifter. See what makes it worse, or makes it better. If the housing is a slighly different length, this will have an effect on it as well.

  5. #5
    Senior Member bklyn74's Avatar
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    ancient thread, i know, but i am having the same problem. everything is new and there is definitely some unsolicited shifting going on in the back, especially when i get out of the saddle.

    ivan, are you suggesting trimming down the length of cable housing going into the rear derailleur?

    i've tried everything else i know to try: ensuring the chain is the proper length, making sure the range of the derailleur is set properly, and endless fiddling the the adjusting barrel.

  6. #6
    Senior Member sydney's Avatar
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    Quote Originally Posted by bklyn74
    ancient thread, i know, but i am having the same problem. everything is new and there is definitely some unsolicited shifting going on in the back, especially when i get out of the saddle.

    ivan, are you suggesting trimming down the length of cable housing going into the rear derailleur?

    i've tried everything else i know to try: ensuring the chain is the proper length, making sure the range of the derailleur is set properly, and endless fiddling the the adjusting barrel.
    Actually he was just guessing. Slight differences in the the lengrth of the housing between new and old are accounted for in properly adjusting the derailer. Way too long or short have been known to cause problems,but not what you or the other poster are experiencing.

  7. #7
    Senior Member bklyn74's Avatar
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    thanks sydney. i have a suntour rd and relaxing the cable tension a bit seems to help. i also read sheldon's article on the subject and greased my cable guides on the bottom bracket and that seems to have helped also. don't have time to really put it through the paces right now, but the grease seems to be smoothing things out nicely.

    yet again, thanks bf and thanks sheldon! where would i be without you!

  8. #8
    Senior Member sydney's Avatar
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    Quote Originally Posted by bklyn74
    thanks sydney. i have a suntour rd and relaxing the cable tension a bit seems to help. i also read sheldon's article on the subject and greased my cable guides on the bottom bracket and that seems to have helped also. don't have time to really put it through the paces right now, but the grease seems to be smoothing things out nicely.

    yet again, thanks bf and thanks sheldon! where would i be without you!
    New(previous post), and suntour RD don't compute. If this is index shifting, then if the shifters,RD and cassette/freewheel aren't all suntour index,then you could have compatibility issues.

  9. #9
    TWilkins
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    Had the same problem last year...couldn't figure it out and get it fixed, so finally took it to the LBS. Mechanic there scratched his head a few minutes, then decided that perhaps my derailer hanger was slightly bent. Used the park tool on it (which confirmed a very slight bend) and solved the problem for me.

    Funny thing was that the hanger was just barely bent...not enough to detect by eyeballing it. Just proves that a fella can't have too many tools in his garage!

  10. #10
    Senior Member bklyn74's Avatar
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    Quote Originally Posted by sydney
    New(previous post), and suntour RD don't compute. If this is index shifting, then if the shifters,RD and cassette/freewheel aren't all suntour index,then you could have compatibility issues.
    right you are. i misspoke. the cassette (ultegra), freewheel (ultegra) and shifters (DA) are new. i gave up on indexing and am running friction. i have a shimano 600 RD i'd like to put on there, but the design of the thing makes it virtually impossible to screw down the cable.* the nut is is a spot that i cannot reach with a wrench of any kind which is a real PITA. i'm currently out of $ for this project, so a new RD is going to have to wait.

    *i'm officially off-topic now, but if anyone knows a good way/trick to get the cable clamped into a shimano 600 RD, please feel free to pass it on.

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