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  1. #1
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    New question here. FSA Gamma drive. Chain rubs front der. when pedaling hard

    My new bike has an FSA mega exo BB and gamma drive crank. When I pedal hard I an getting rubbing on the front derailleur when the chain is on the 2nd or 3rd chain ring and the rear der is in 8th & 9th.

    I tried adjusting the front derailleur (X7) but can't seem to get it to shift right without the rubbing. This is especially true on the 3 to 2 down shift.

    Any suggestions?

  2. #2
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    Anyone?

  3. #3
    Professional Sociopath
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    It sounds like there's a bit of flex in your frame at the Bottom Bracket which isn't that unusual I get it quite often especially on my steel bikes. What bike are you on?
    Do people think you are strange??

    Do you??

    ....Then you may be on the right track.
    (Rev. J.R. Bob Dodds)

  4. #4
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    I'm on a new Iron Horse Warrior 5.0 Hard tail. Its an aluminum frame bike.

  5. #5
    Brant-C.
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    the flex could be coming from your bb or crankset also...

    don't know much about your crankset but i would say it's flex...

    outboard bearing bb/crankset may fix the problem.

    you might check reviews on your bike on this forum and elsewhere on the web.

    sorry not much help
    I just like riding my mountain bike.

  6. #6
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    The cranks set is FSA gamma drive BB is Mega Exo (external BB). Its one of FSA's lower end cranks.

    It might just be an adjustment but its a brand new bike and the BB and crank are already on the bike when it comes. I also didn't know how to adjust it. Other than the flex it works fine, smooth, and noise free.

  7. #7
    Brant-C.
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    you may want to have a tune up done and have them check the bottom bracket and cranks for tightness...
    I just like riding my mountain bike.

  8. #8
    Professional Sociopath
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    there's always a bit of flex in the BB area and especially if you put a lot of power through the pedals they will always be prone to flex my bike are mostly steel so I'm used to it.
    Do people think you are strange??

    Do you??

    ....Then you may be on the right track.
    (Rev. J.R. Bob Dodds)

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