Advertise on Bikeforums.net



User Tag List

Results 1 to 3 of 3
  1. #1
    Senior Member
    Join Date
    Oct 2008
    Posts
    94
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Cranks coming loose?? HELP

    So i have searched around a little bit and spent some time removing and reinstalling my cranks and bottom bracket.

    The frame is a Soma Rush and the cranks are Sugino and the sprocket is Sugino messenger. Everytime i ride, the cranks will come loose and if i rode far enough, would probably come all the way off. I have to bring the allen wrench with me if im riding more than a mile cause they become loose fairly quick. I have tried a little bit of locktite and stuff but it doesnt seem to work.

    Any ideas???? Any replies are greatly appreciated. Thanks in advance.

    -Tyler

  2. #2
    :)
    Join Date
    Nov 2006
    Location
    duluth
    My Bikes
    '07 Pista, '09 Fantom Cross Uno, '8? Miyata, '67 Stingray, '0? Zoo mod trials, Tallbike, Chopper, '73 Schwinn Collegiate, '67 Triumph Chopper, '69 CB350, '58 BSA Spitfire, '73 CB450
    Posts
    3,392
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Probably need new cranks. Once they come loose, the tapers will get marred/deformed and not seat properly, hence the tendency to continue to loosen up.
    Quote Originally Posted by Santaria View Post
    because physics has more street cred than tarckstars.

  3. #3
    Yo!
    Yo! is offline
    Senior Member Yo!'s Avatar
    Join Date
    Jun 2009
    Location
    Dallas, TX
    My Bikes
    Panasonic NJS Keirin x2, Level Professional, Bianchi CUSS, GT Pulse
    Posts
    1,047
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    What taper is your spindle? How old are your cranks? Chainring type is irrelevant for this issue, but remember, installing and removing a square taper crank frequently will enlarge the hole ever so slightly.

    As far as spindles, A JIS taper spindle will fit an ISO crank arm, but sit about 4.5mm out. Conversely, an ISO taper spindle with a JIS crankarm will sit 4.5mm closer, and sometimes the taper will never allow you to fully tighten the crank arm before the bolt bottoms out.

    If you're using messenger crank arms, those are JIS taper. Make sure you don't have an ISO taper spindle in your current bb.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •