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Thread: What size Torx or is it something else?

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    Default What size Torx or is it something else?

    Shimano FCM9100/M9120 left/non-drive crank arm. I'm attempting to remove what appears to be the large "torx" fastener in the picture. Shimano did not know what size and recommended not removing it. Where is the fun in that! Is it a T100? Or something else? Any and all suggestions are greatly appreciated.
    IMG_20210503_150522531[1].jpg

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    Default Re: What size Torx or is it something else?

    It's not a Torx. It's not even available in the Shimano tool catalog. It looks like it retains the allen bolt for a one-key release of the crank arm.

    If I truly wanted to remove it, I'd find a couple screwdrivers or maybe allen wrenches whose shafts closely match the recesses. I'd clamp these screwdrivers/allen wrenches in a vise with the ends sticking up just enough to fully seat in the crank arm. Then I'd place the crank arm over them and use the arm for leverage and twist. If it's like a typical one-key release, I'd twist in a counterclockwise direction. I'd squirt lube in the threaded area. Some fiddling around would get a good fit.

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    Default Re: What size Torx or is it something else?

    11 teeth! That is a prime number, so presumably deliberately chosen by Shimano not to fit a two, three, four or six toothed or sided tool.

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    Default Re: What size Torx or is it something else?

    Looks like a crank extractor device to me - it's holding the bolt in place so that when you back the bolt out it pulls (or sort of pushes, really) the crank arm off of the crank spindle.

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    Default Re: What size Torx or is it something else?

    Quote Originally Posted by RichTheRoadie View Post
    Looks like a crank extractor device to me - it's holding the bolt in place so that when you back the bolt out it pulls (or sort of pushes, really) the crank arm off of the crank spindle.
    What he said. Leave it. Good idea'r to drip a wee dram of lube on the face so it never grabs the crank arm and winds itself out along with a healthy chunk of crank arm threads.

    From the department of: Cuz stuff happens.

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    Default Re: What size Torx or is it something else?

    My apologies for not giving a little more information. The arm fails to engage the threads on the spindle. My plan was to remove the bolt then see why. The arm has been covered under warranty. If removed would the splines line up like an Octalink? Are the threads damaged? Very good catch on the number of teeth. Yes, speaking to Shimano only resulted in "we do not have that information" and "do not disassemble". The plan now is to cut up an old socket to fit the splines. However, if anyone does know what type of fastener it is...

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    Default Re: What size Torx or is it something else?

    Sorry for your loss.

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    Default Re: What size Torx or is it something else?

    Quote Originally Posted by DBordewisch View Post
    My apologies for not giving a little more information. The arm fails to engage the threads on the spindle. My plan was to remove the bolt then see why. The arm has been covered under warranty. If removed would the splines line up like an Octalink? Are the threads damaged? Very good catch on the number of teeth. Yes, speaking to Shimano only resulted in "we do not have that information" and "do not disassemble". The plan now is to cut up an old socket to fit the splines. However, if anyone does know what type of fastener it is...
    Not seeing the offending crank interface in person, my guess is that you're trying to install the crank when it's not lined up right. Kind of like what happened when you tried to install Octalink cranks without the splines being lined up correctly

    But this is a guess.

    M

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    Default Re: What size Torx or is it something else?

    Would some part of this be reverse threaded? Meaning any attempt to loosen it would actually be tightening it.
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