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  1. #1
    Yeah. I Race. minichamp31's Avatar
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    Cranks loosening

    I was riding my bike today and I noticed my cranks were loose. I just got it about a month ago. I tried to tighten them and they were tight, and then I rode it again and the cranks became loose again. Why do the cranks keep coming loose?

  2. #2
    Coast Freely callumrides's Avatar
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    take it to a bike shop. or if your bb is unsealed the bearings may be coming loose and they just need a nip up.

    cranks is a fairly general term.
    your arms?
    spindle?
    bottom bracket? what?

  3. #3
    Yeah. I Race. minichamp31's Avatar
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    Quote Originally Posted by callumrides
    take it to a bike shop. or if your bb is unsealed the bearings may be coming loose and they just need a nip up.

    cranks is a fairly general term.
    your arms?
    spindle?
    bottom bracket? what?
    I'm pretty sure it's the spindle because I can move it back-and-forth a little bit through the bottom bracket.

  4. #4
    Senior Member eightdip's Avatar
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    Cranks always come loose, tighten them a lot
    Dip me in chocolate and feed me to the Lesbians, eight times because thats my name.

  5. #5
    Senior Member barba's Avatar
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    I usually don't post in BMX, but you want to get that crank bolt down real tight. Slip a pipe over the wrench and really give it a good tug. Riding a loose crank will deform the crank arms because they are soft AL and the BB spindle is hardened steel. This will ruin just about any crank fast and coming loose frequently is a good sign damage may have happened.

    If it is a new bike, the shop may have screwed this up by under torquing the crank bolts. I would inspect the crank carefully and ask them to make it right if there is damage.

  6. #6
    I rule with a mighty leg FitRider 921's Avatar
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    My cranks never came loose.
    I am Gunz. Gunz are me.

  7. #7
    Senior Member Punx's Avatar
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    That happens with my bike also. I have to tighten it everyday and when i get it as tight as it goes the next day its loose again.

  8. #8
    Yeah. I Race. minichamp31's Avatar
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    Quote Originally Posted by Punx
    That happens with my bike also. I have to tighten it everyday and when i get it as tight as it goes the next day its loose again.
    It sounds like you need some Loc-tite(sp?)

  9. #9
    Senior Member Punx's Avatar
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    What is this Loc-tite you speak of.

  10. #10
    Yeah. I Race. minichamp31's Avatar
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    Quote Originally Posted by Punx
    What is this Loc-tite you speak of.
    Stuff that locks the threads. Good stuff.

  11. #11
    I rule with a mighty leg FitRider 921's Avatar
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    Quote Originally Posted by minichamp31
    It sounds like you need some Loc-tite(sp?)
    word. I think this is the first time I've ever agreed with you. You should feel proud.
    Last edited by FitRider 921; 03-24-07 at 07:42 PM.
    I am Gunz. Gunz are me.

  12. #12
    Yeah. I Race. minichamp31's Avatar
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    Quote Originally Posted by FitRider 921
    You should feel proud.
    I do.

  13. #13
    \,,/(^_^)\,,/ new_dharma's Avatar
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    Loctite
    Permatex

    To get a REALLY good set, use the Anaerobic activator...stay away from the Reds...they are HARD to remove once set (next to impossible)
    You know you're getting old when you look at a beautiful 19-year-old girl and you find yourself thinking, "Gee, I wonder what her mother looks like?"

  14. #14
    Your Sport Sucks I_Suck_At_BMX's Avatar
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    get a sawzall and cut them off...

  15. #15
    Long haired freak. wethepeople's Avatar
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    Quote Originally Posted by barba
    I usually don't post in BMX, but you want to get that crank bolt down real tight. Slip a pipe over the wrench and really give it a good tug. Riding a loose crank will deform the crank arms because they are soft AL and the BB spindle is hardened steel. This will ruin just about any crank fast and coming loose frequently is a good sign damage may have happened.

    If it is a new bike, the shop may have screwed this up by under torquing the crank bolts. I would inspect the crank carefully and ask them to make it right if there is damage.
    BMX cranks are almost always steel.

    "the bus came by and I got on, that's when it all began...there was Cowboy Neal at the wheel of a bus to never-ever land."


  16. #16
    I rule with a mighty leg gnr rocker's Avatar
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    He doesnt know that because he doesnt ride bmx. he even said so

  17. #17
    Canon fiend MadMan2k's Avatar
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    It still might screw it up, it's usually a terrible idea to ride things when they're loose.

  18. #18
    Baned. mude's Avatar
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    your most likely not tightening htem right

    first losen the thing at the top of the cranks
    then tighten the compression bolts on each side
    then tighten the thing at the top
    5000

  19. #19
    Senior Member eightdip's Avatar
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    If he has pinch bolts
    Dip me in chocolate and feed me to the Lesbians, eight times because thats my name.

  20. #20
    Senior Member Punx's Avatar
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    Quote Originally Posted by mude
    your most likely not tightening htem right

    first losen the thing at the top of the cranks
    then tighten the compression bolts on each side
    then tighten the thing at the top
    Thats the way i do it. It still becomes very loose. I'll figure it out sometime soon. Thanks

  21. #21
    dillyshotback
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    Why kind of cranks are they? That is kind of an important factor here. If you have older Odyssey cranks, get dat **** warrentied. If you have profiles, they just develop a bit of a wobble...make sure you have enough spacers and then loctite it. If you have wombots or Flys...they probably don't wobble. If you have primo's may as well take it and get profiles.

  22. #22
    Baned. mude's Avatar
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    stop sucking at working on your bike
    5000

  23. #23
    Senior Member Punx's Avatar
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    Lol...i already fixed it.

  24. #24
    ride. premiumbmx2005's Avatar
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    Quote Originally Posted by barba
    I usually don't post in BMX, but you want to get that crank bolt down real tight. Slip a pipe over the wrench and really give it a good tug. Riding a loose crank will deform the crank arms because they are soft AL and the BB spindle is hardened steel. This will ruin just about any crank fast and coming loose frequently is a good sign damage may have happened.

    If it is a new bike, the shop may have screwed this up by under torquing the crank bolts. I would inspect the crank carefully and ask them to make it right if there is damage.
    the pipes a bad idea. doing that will over tighten it. and most bmx cranks are steel, not aluminum.

    i think whats wrong is your bottom bracket is loose, assuming its american. if its unsealed there should be a big nut you tighten. im not 100% sure though i havnt even seen an american bb for a while.

  25. #25
    Dig. KinetikBiker's Avatar
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    Locktite them.
    Then weld them and make custom Wombolts! (Sarcasm)

    If you have one piece cranks...they come loose alot.

    Take it to a shop.

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