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  1. #1
    i ride a bicycle
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    torque crank bolts to... ?

    Hey guys sorry I didn't search, but I need a quick answer and sifting through search results usually takes me longer than just asking a simple question.

    I have a cup and cone, loose ball, BB with a square taper campy spindle on my peugeot fixie conversion. Bulletproof bmx cranks (budget reasons).

    What is the proper tightening torque for the crank bolts? The cranks just started to get a tiny bit loose, hopefully I caught it before the cranks have been irreperably damaged. I originally tightened the bolts as tight as I could get them with a 3/8" drive wratchet wrench, but I'm guessing that's not tight enough. I have a 1/2" drive torque wrench. What's the proper torque to use this time?

    Mac

  2. #2
    Senior Member hockeyteeth's Avatar
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    Sometimes the cranks loosen on the spindle after you initially tighten them and ride for a bit. I've heard that this is normal and also that it isn't... If I were you I would just tighten the hell out of them again and watch for loosening.

  3. #3
    fixed rider soon :)
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    if the hockeyteeth's solution didn't solve your problem, I wonder if the taper of the spindle is the same as the crank's one.


    is both of your crank loose?

  4. #4
    left treadle forward danish's Avatar
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    german torque specs: gootentite.

  5. #5
    live free or die trying humancongereel's Avatar
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    Quote Originally Posted by hockeyteeth
    Sometimes the cranks loosen on the spindle after you initially tighten them and ride for a bit. I've heard that this is normal and also that it isn't... If I were you I would just tighten the hell out of them again and watch for loosening.
    +1. for about a week i carried a crank wrench with me to tighten the bolts after rides. longer than i needed to, but it gave me peace of mind to tighten the things down.
    have:ea50 flats, black, light, stiff.
    144 bcd 3/32" 49t sugino track chainring, possibly 75.

    want: risers, light, stiff, 1", black if that can be
    144 bcd 46t or 47t chainring any kind or width

  6. #6
    i ride a bicycle
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    Quote Originally Posted by Baube
    if the hockeyteeth's solution didn't solve your problem, I wonder if the taper of the spindle is the same as the crank's one.
    I am a little worried about this; I read a little about it and it was always in the back of my mind when I put the bike together. I could never get a definative answer whether or not the bulletproof cranks and campy spindle had the same taper. They seemed to fit together ok, but I don't know how "poor" the fit should be if they are incompatible. Would it have been grossly obvious if they were?

    Mac

  7. #7
    Taking "s" outta "Fast" AfterThisNap's Avatar
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    Bulletproof and Campy don't mix. The damage won't be obvious until after a few hundred miles.


    Quote Originally Posted by sac02
    I am a little worried about this; I read a little about it and it was always in the back of my mind when I put the bike together. I could never get a definative answer whether or not the bulletproof cranks and campy spindle had the same taper. They seemed to fit together ok, but I don't know how "poor" the fit should be if they are incompatible. Would it have been grossly obvious if they were?

    Mac
    Carries suspicious allegiance to Brooklyn Machine Works.

  8. #8
    Your mom
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    Torque = tight as hell.

  9. #9
    Senior Member GetOutOfNJ's Avatar
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    Quote Originally Posted by Baube
    is both of your crank loose?
    all your base are belong to us

    How about a spindle beer can shim? that's one of those things that I've always thought to try, but never actually done, because I can't imagine it working. But I'd like to know.

  10. #10
    asleep at the wheel fixedpip's Avatar
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    Torque values for crank bolts are manufacturer specific. Pretty much need at least 300 inch/pounds and most are spec'd higher than that.

    Theres some basic values here:
    http://www.parktool.com/repair/readhowto.asp?id=88

  11. #11
    i ride a bicycle
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    Quote Originally Posted by AfterThisNap
    Bulletproof and Campy don't mix. The damage won't be obvious until after a few hundred miles.
    Damn.

    The problem is fixed for the moment. I torqued both crank bolts to 32.5 ft-lbs.

    Also: when I got down there to really inspect things as I did the crank bolts, I noticed the adjustable side of the BB cup had come loose, about an eighth of a turn. The cranks were a little loose, but it turns out I was also feeling a little play in the BB itself. So that is now also fixed, we'll see how long it all lasts.

    Mac

  12. #12
    live free or die trying humancongereel's Avatar
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    damn, should've read the OP more closely.
    have:ea50 flats, black, light, stiff.
    144 bcd 3/32" 49t sugino track chainring, possibly 75.

    want: risers, light, stiff, 1", black if that can be
    144 bcd 46t or 47t chainring any kind or width

  13. #13
    Senior Member Rattlebag's Avatar
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    Quote Originally Posted by danish
    german torque specs: gootentite.
    Achtung! Keine Gebulletproof Crankentorquen mit die Campenbotzombrachet! Geblinkenflashen und Gespitzensparken!

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