Shimano Freehub replacement- Mtbr.com
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  1. #1
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    Shimano Freehub replacement

    I have a Shimano Freehub (10spd) that I am trying to replace. FH-M785 which I'm going to replace with a compatible FH-M770. From everything I've been able to find online I should be able to use a 14 mm allen wrench to remove the freehub fixing bolt. I have a 14 mm allen but it won't go into the fixing bolt.

    I'm looking for ideas. Do I need a special tool or should I try a different 14 mm allen?

  2. #2
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    Don’t they just twist off?


    Sent from my iPhone using Tapatalk

  3. #3
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    Wait until tonight. I'll tell if my experiment with my tool will work. Maybe you just have an out-of-spec tool, maybe you need a special/modified tool.

  4. #4
    Magically Delicious
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    Did you try a 12 mm?

    Why are you replacing it?
    A bad day of cycling is better than a good day at work

    Work Truck - Dassault Falcon 7X

  5. #5
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    Did you pull the axle out first from the non-drive side? The service instructions do say a 14mm allen key will remove it: https://si.shimano.com/pdfs/si/SI-3TG0A-002-ENG.pdf

    Tim

  6. #6
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    I've got the axel out and the 14 mm allen is just the tiniest bit too big. (I've tried two different ones.)

    I'm replacing it because it is binding up as I try to spin it. The wheel would lock up and not spin at times. I figure that the pawls are jamming.

    It's an older wheel and I want to use it on a spare bike, so I don't really want to buy a new hub/wheel. Although I probably should have bought a new one at this point for all the time and parts.

  7. #7
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    Just to complete the thread and in case anyone else ever has the same problem.

    I feel pretty stupid. I finally took the wheel to the LBS and the tech told me he'd seen this before. He took my 14 mm allen and a hammer and tapped it into the Freebody fixing bolt. He had to take a smaller allen from the non drive side to knock the 14 mm allen back out once we had the new Freewheel body on.

    All done in less than 5 minutes.

  8. #8
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    Bottom line is that you got it done and learned something through the experience.
    A bad day of cycling is better than a good day at work

    Work Truck - Dassault Falcon 7X

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