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Crank arm problem on fixie ... help!

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  • 22-08-2008 10:49pm
    #1
    Caroline_ie
    Registered Users Posts: 5,400 ✭✭✭


    The left crank arm thingy off my fixie is about 1 cm off compared to the right one, making my pedaling quite unconfortable, as my leg is not pedaling straight. I hope this makes sense ..

    How can I rectify it? Push it in or something. Got bad cramps during my spin tonight on the left calf ...


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    #2
    TinyExplosions
    Registered Users Posts: 6,860 ✭✭✭TinyExplosions


    Caroline_ie wrote: »
    The left crank arm thingy off my fixie is about 1 cm off compared to the right one, making my pedaling quite unconfortable, as my leg is not pedaling straight. I hope this makes sense ..

    How can I rectify it? Push it in or something. Got bad cramps during my spin tonight on the left calf ...

    What do you mean by off? they aren't in a straight line, or the left one is wider than the right? Can you show us a picture?


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    #3
    Caroline_ie
    Registered Users Posts: 5,400 ✭✭✭Caroline_ie


    TinyExplosions wrote: »
    What do you mean by off? they aren't in a straight line, or the left one is wider than the right? Can you show us a picture?
    Yes the left is 1 cm wider from the rest of the crank.


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    #4
    TinyExplosions
    Registered Users Posts: 6,860 ✭✭✭TinyExplosions


    It sounds like the crank arm just isn't pushed in to the bottom bracket far enough. You should be able to shove it in (and by shove I mean coax in a way that won't ruin the crank!)


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    #5
    stuf
    Registered Users Posts: 578 ✭✭✭stuf


    Are your crank bolts tightened properly - even if they weren't this wouldn't account for 10mm difference.

    Put each pedal upmost and parallel with the seat tube and measure the seperation between seat tube and crank - that would be the easiest way to tell the difference in crank positions. Maybe it's just different from your road bike.


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    #6
    Wez
    Registered Users Posts: 1,747 ✭✭✭Wez


    Depends on a lot of different thing.. Make/model or measurements taken, even a picture would help!

    Prolly needs to be tightened via crank bolts but I reckon if you've had the bottom bracket replaced at any stage, that could be the problem!

    Normally you'd adjust one side to get your chainline right (if it's a conversion fixie), but to get that right on one side, and might have forgotten (not focused on) the measurements on the left (non-drive) side. You want your feet to be as close to each other as possible to have a natural pedal like when you're walking.

    Basically, I think it could be your bottom bracket, that's what I'd have a look at if you've tightened the crankbolts and it's still off.

    Hope this helps! Lettuce know how you get on, wanna know how this can be solved..


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