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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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Answers :

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.
Try putting Loctite on the thread then tighten them.

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