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Pedal popped off...Am I screwed?(4 posts)

Pedal popped off...Am I screwed?Tele_Pathic
Aug 2, 2002 7:32 PM
I'm out for a ride tonight when suddenly the left pedal pops out of my crank arm. Luckily, I was able to steer to safety.

While examining the crank arm and pedal, I notice some metal shavings. I try to reattach the pedal but meet incredible resistance. Try again, same thing. Try a different set of pedals, same thing. Try some Pedro's grease, same thing. The pedal will seat itself, but as I tighten it up, it settles into an awkward angle and tightening the pedal becomes impossible.

So, here's my question: Are the threads on this pedal stripped? Is there an easy solution? Or do I need a crank
arm? Thanks in advance.

Tele Pathic
re: Pedal popped off...Am I screwed?mgolebiewski
Aug 2, 2002 9:50 PM
When the same thing happened to my MTB I did damage to the threads in the crank arm. My guess is you did the same and are going to need a new crank.
You need a new left crank armKillerQuads
Aug 3, 2002 3:54 AM
The pedal threads are steel and the crank arm threads are aluminum alloy. The softer aluminum alloy threads on the crank arm have been stripped. The pedal may or may not be reuseable. When fitting an aluminum alloy piece to a steel piece, it is a good idea to use grease or anti-seize compound at the contact point (crank arm to spindle is another example). It is also good to start threading by hand (before using a tool) to avoid stripped threads.

It should also be noted that the left side has left hand threading (counter clock wise to tighten) and the right side is right hand threading. I think this is so a seized pedal bearing will unscrew the pedal instead of twisting your ankle.

A high volume bike shop might have spare left arms, but you will need some luck to find the same model and length. Perhaps they can special order you a left arm. Or it could be a good reason to upgrade to a better crank, just make sure the bottom bracket is compatible. What make and model is the crank?
re: Pedal popped off...Am I screwed?spiderwj
Aug 5, 2002 7:24 PM
The resistance is a good thing. It means that there is at least some threads left in the crank.

I would take it to a shop and see if they can run a tap through it and straighten it out. I have seen pedals come out and take all the treads out so there is nothing but a huge hole left. I have also seen pedals work themselves free and only take out a few threads where a tap has fixed it. I would try the tap first and try to save a few bucks. Tough call without seeing it. Best of luck.