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  1. #1
    Junior Member
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    is my crank is more or less junk?

    I haven't ridden my bike for about 2 years now because of this

    I think the picture will tell almost everything


    and the crankshaft bit it attaches to is already a bit more of an octagon than a square

    it just started creaking one day and on the same ride it started wobbling around for about half a cm. My knowitall uncle tried various spring washers and stuff but it didn't help.

    the side with the gears is ok though

    this thing is shot right? what all exactly do I need to replace?

  2. #2
    Senior Member Ziemas's Avatar
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    You need a new crank arm that is the same length as the one with the gears. There should be a number printed on it (usually 170, 172.5, or 175) that will tell you what length in mm the arm is. What kind of bike is it?

  3. #3
    Senior Member ollo_ollo's Avatar
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    You may also need to replace the bottom bracket, or at least the spindle because the edges are rounded over.
    visit my homebuilding blog: www.monoplanar.blogspot.com

  4. #4
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    heres the bottom bracket


    that still ok? (even if its been sitting in my garage for 2 years)


    The only marking on the arm is "CPI 8" and my empirical measurements put it at 170mm

    oh and here is the bike

  5. #5
    Senior Member
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    That's a sweet looking little bike. Take the bike and crank arm to your local bike shop...they may have a used crank arm laying around. A friend of mine had the same problem 2 months ago...cost less than 20 bucks to get it fixed. A good LBS is your friend.

    Mike

  6. #6
    Senior Member Retro Grouch's Avatar
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    Quote Originally Posted by MikeyLikesIt View Post
    That's a sweet looking little bike. Take the bike and crank arm to your local bike shop...they may have a used crank arm laying around. A friend of mine had the same problem 2 months ago...cost less than 20 bucks to get it fixed. A good LBS is your friend.
    Yup. That's a common enough problem that the shop where I used to work kept replacement arms in stock. You have to get the length right and there's two ways the hole can be oriented so you have to get that right. If you aren't too picky about it being an exact match for the right side it should only be about a $20.00 job.

  7. #7
    cab horn
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    Quote Originally Posted by Retro Grouch View Post
    Yup. That's a common enough problem that the shop where I used to work kept replacement arms in stock. You have to get the length right and there's two ways the hole can be oriented so you have to get that right. If you aren't too picky about it being an exact match for the right side it should only be about a $20.00 job.
    +1

    Diamond or square.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  8. #8
    Downhill Racer PhilThee's Avatar
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    Easy fix.

    Git r dun
    "I didn't see him/her" is a confession, not an excuse.

  9. #9
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    Quote Originally Posted by ollo_ollo View Post
    You may also need to replace the bottom bracket, or at least the spindle because the edges are rounded over.
    BB spindle is hardened steel, crank arm is aluminum - it's no contest. The spindle will be OK, unless damaged by other circumstances.

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