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  1. #1
    Junior Member
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    Sep 2008
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    Advice please re : Crank arms

    Good afternoon all,

    Ive got a GT all terra Timberline (approx 1989) and while off roading recently my left hand side crank arm came loose. I had heard that when this happened the best thing to do is to replace the crank arm, so I subsequently purchased a new one and fitted it.

    After 100 miles, this one also worked loose, I subsequently tightend it right back up but again it came loose after just 10 miles!

    Am I missing something here ?? any advice welcome.

  2. #2
    Senior Member pyroguy_3's Avatar
    Join Date
    Oct 2005
    Location
    Blo-no, IL
    My Bikes
    2005 Specialized Hardrock Sport, 1970's Miyata Liberty ala fixed gear
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    Either the crank was not on tight enough to begin with, or it loosened up and then rounded out. Is it a square-taper bottom bracket? After i put new cranks on, I check them after a ride to make sure they are still tight. The problem may also lie in that the bottom bracket's square-taper has been rounded out. This would cause the cranks to wear, and eventually become loose. Check that first. Maybe take both crank arms off and see if the bottom bracket looks different on the loose side.
    Erwin Schroedinger will kill you like a cat in a box. Maybe.

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