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  1. #1
    Bike Overhauling Rookie faronmd's Avatar
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    Crank arm Disassembly - WTF?

    Hey all,

    I am in the middle of overhauling a old mountain bike and I am down to the last disassemble - The 2 Crank arms from the chainring and frame. I have all the nuts I can find off the the crank arm ends but it still won't come apart. I thought maybe that the crankarm itself was screwed to the pin but I tried it without any luck. I even tried hammering. There is no sign of a screw holding it in place. I am stumped. Anyone have any insight?

  2. #2
    Senior Member Bill Kapaun's Avatar
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  3. #3
    cab horn
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    Unless it's an emergency, don't even try to pull the cranks without the puller.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  4. #4
    Bike Overhauling Rookie faronmd's Avatar
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    thanks all - something learned everyday.

  5. #5
    Bike Overhauling Rookie faronmd's Avatar
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    Is there an alternative to the crank arm puller? I can't justify buying this tool for a one-time use.

  6. #6
    Senior Member Bill Kapaun's Avatar
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    Quote Originally Posted by faronmd View Post
    Is there an alternative to the crank arm puller? I can't justify buying this tool for a one-time use.
    Do you want the bike to be usable?

  7. #7
    Klaatu..Verata..Necktie? genejockey's Avatar
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    Take it to an LBS, and have THEM pull the cranks off.
    "Don’t take life so serious—it ain’t nohow permanent."

  8. #8
    Bike Overhauling Rookie faronmd's Avatar
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    a simple 'no' to my question would have sufficed.

  9. #9
    cab horn
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    Quote Originally Posted by faronmd View Post
    a simple 'no' to my question would have sufficed.
    no

    Guess I should've made my last post a bit more explicit. Crank puller is $10. Either that or find some sort of Bike recycle/community shop which allows you to use tools for a small fee.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  10. #10
    that bike nut BikingGrad80's Avatar
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    I have heard that if you take the bike for a spin around the block with the nuts off and keep it in a low gear and don't apply much pressure to the pedals that the cranks should fall off and not be damaged. However, I'd still recommend getting the crank extractor.

  11. #11
    Senior Member Deanster04's Avatar
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    Quote Originally Posted by BikingGrad80 View Post
    I have heard that if you take the bike for a spin around the block with the nuts off and keep it in a low gear and don't apply much pressure to the pedals that the cranks should fall off and not be damaged. However, I'd still recommend getting the crank extractor.
    Not the best idea as you can distort the square taper if it comes off when you are applying a lot of pressure when it pops loose. Moreover, often if they over torqued the bolt during installation the riding method won't work easily. I agree with you just buy the tool.

  12. #12
    Bike Overhauling Rookie faronmd's Avatar
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    Crank Puller it is. Thanks ALL!!!

  13. #13
    Elitist Troglodyte DMF's Avatar
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    BE SURE that the outside of the puller is FULLY seated in the crank or you'll strip out the threads. Back the inner part (plunger) all the way out before installing the puller.
    Stupidity got us into this mess - why can't it get us out?

    - Will Rogers

  14. #14
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    Quote Originally Posted by BikingGrad80 View Post
    I have heard that if you take the bike for a spin around the block with the nuts off and keep it in a low gear and don't apply much pressure to the pedals that the cranks should fall off and not be damaged. However, I'd still recommend getting the crank extractor.
    This technique is normally used when the crank is to be discarded once it's off. It usually distorts the square hole in the crank arm enough that the crank never fits properly again even if you are careful.

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