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Bike pedal arm keeps falling off as i pedal.

The whole arm falls off regardless of how tight i make the nut. what part am i looking for ?

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You need a new crank arm. If you ride with the nut loosened what happens is the square part of the bottom bracket shaft wears the hole out in the aluminum crank and it no longer fits snugly no matter how much you tighten it down.

Posted on Jul 11, 2009

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Try putting Loctite on the thread then tighten them.

Posted on Mar 05, 2009

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So my Dynacraft Next turbo bicycle crank arms and pedals were wobbling and found out the issue was a bent bearing.So instead of taking it apart,we decided to hammer the bent bearing back into the crank...


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For this one you are best taking it into your local bike shop and have them take a look at why both of these fell off. There are a number of reasons, from stripped thread to missing bolts and nuts to improper assembly. None of these are a good scenario with a childs bike, or any bike for that matter.

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