Shimano tool interchangeability - BB to Chainring to crank- Mtbr.com
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  1. #1
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    Shimano tool interchangeability - BB to Chainring to crank

    Hi, I'm about to convert my 3x9 drivetrain to 1x12 with


    1. Shimano Hollowtech II bottom bracket MT800
    2. Shimano SLX M7100 direct mount crank
    3. Sunrace M903 cassette that fits on the Shimano HG cassette.
    4. Shifter and Rear Derailleur


    I have the following tools:
    1. Shimano HG cassette lockring tool
    2. chaindrive cassette holder
    3. Puller tool to remove the existing square taper crank
    4. Tool to remove the old style Shimano square taper bottom bracket
    5. all the allen keys I need and 2 adjustable torque wrenches.


    What I don't have are tools to tighten the Hollowtech II BB and the direct mount chainring onto the Shimano M7100 crank (unless it comes in the box with it)

    If the SLX M7100 crank comes with its own tool can this same tool tighten the BB. They both appear to have 16 lobes but may have different ODs.

    Otherwise what's the recommendation. Should I get a socket type or wrench type tool for the Hollowtech II BB and also the chainring?

    What I also don't get is the different tools for different Hollowtech II types. Is there a universal tool that does all Hollowtech II?

  2. #2
    thecentralscrutinizer
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    The tools are different. I use the socket type since it's easier to keep square on the BB.
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  3. #3
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    Quote Originally Posted by mopartodd View Post
    The tools are different. I use the socket type since it's easier to keep square on the BB.
    My question is about the tool diameter. Shimano seems to have a different adapter with every bottom bracket. I don't want to buy a new socket for each different model of Hollowtech II.

  4. #4
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    bb is 16-Notch X 41mm which seems to be the same as the chainring tool, and you don't need to buy a tool for each different bb, just the one you are going to install! but you can also use the chainring tool assuming it's deep enough to engage the bb without causing any damage

  5. #5
    thecentralscrutinizer
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    Quote Originally Posted by stackveteran View Post
    My question is about the tool diameter. Shimano seems to have a different adapter with every bottom bracket. I don't want to buy a new socket for each different model of Hollowtech II.
    You asked if you could use the same tool for the 7100 chainring and MT800 BB...No they are different.

    Park tool BBT-9 = 46mm ID
    Shimano TL-FC24 = 39mm ID
    Shimano FC41 = 41mm ID

    All measurements were taken between lobes at the widest point. I want to say that the first two tools on the list will cover all Shimano external BB types.
    2019 Giant Fastroad Advanced
    2019 Giant Anthem Advanced 1 29
    2020 Giant XTC Advanced 29
    2019 Surly Karate Monkey

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