Another drivetrain question- drivetrain noise- Mtbr.com
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  1. #1
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    Reputation: Streetdoctor's Avatar
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    Another drivetrain question- drivetrain noise

    went for a nice ride yesterday and tried to remain more cognizant of what gear I'm in. I realized I don't use the largest chainring on the crank very much (3x9) but when I shift to a harder gear (3 smallest cogs) while on the middle chainring the drivetrain makes a lot of noise, and sometimes it won't shift onto the smallest cog. What causes this and how can I fix it? Thinking of switching to 2x9 if I can alleviate the problem.

  2. #2
    Tool
    Reputation: Pedalphile's Avatar
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    There are many potential causes, ranging from a slightly bent hanger to worn pulley teeth.

    If the drivetrain is worn, stuff like this can happen.

    If the shifter cable is getting a little sticky, this could happen (particularly since the smaller cogs are where the cable sees the lowest tension). This would likely affect the big ring as well if this were the cause. You can check this by determining whether the derailleur is touching the limit screw when all cable tension is released.

    Good luck,
    Pete
    I can barely get my mouth around it.

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