Question about Schwinn Mesa Gs Mountain Bike

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The crank arm is stripped on the left side of the bike

The crank arm is stripped on the left side and the pedal falls off. Is there a suggested approach to repair/replace the crank arm?

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Yes, the crank-arm could be replaced.
1.You would need to remove the flat nut holding the crank to the frame. And then take out the bearing.
2. A special open-ended wrench is required to remove this nut. Please visit your local bicycle shop for a new crank-arm, and the required tools, also.
3. Put in new crank-arm and its bearing.
4. Grease the bearing.
5. Tighten nut.
6. Give it a test ride.

Posted on Dec 10, 2009

Testimonial: "Thanks very much for your assistance. I have ordered the crank arm and will follow your input."

  • Darcy Breau
    Darcy Breau Apr 29, 2016

    I had the same issue, replaced my crank arm, locktite etc. Blew the new crank arm in 2 rides. ( casual bike paths). I suggest upgrading the whole crank assembly. This is my plan. Either that or carry a 14mm socket with you so you can tighten on the fly.


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Above instructions are inaccurate, incomplete and not applicable to most situations. You would be better to Google "replace left crank arm" and follow the instructions that match the type of arm you have. Best yet if you have a bike co-op nearby go to them for assistance and use of their tools.

Posted on Apr 30, 2016


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Model :x 3519 right pedal stripped

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Better replace the pedal and most probably the crank arm as well. Sometimes a new pedal can cut the threads true again on the crank arm but the crank arm may need replacement too, depending on the damage. Remember to fit the correct side pedal. The pedal threads differ between left and right and pedals are usually marked "L" or "R".

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I would just stop by a welding shop and have them weld the pedal arm on. You can buy another whole bike for what it costs to get a helicoil like that done. If it's the left hand thread, impossible.

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The pedal will not tighten up on the crank arm on the chain side, i think the thread has been stripped

Take it to a bicycle shop or a mchine shop and have them look at it. Maybe they can tap it out. Or the Bike Shop can replace the whole crank.

BTW: if there is resistsnce when tightening something like that - STOP.

Did you do the left side yet? It's left threaded.

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If it's stripped the crank arm will need to be replaced. It's probably more expensive to fashion a repair with helicoils and taps, even if you COULD find a left-handed one for the left side.

Get on your favorite search engine and look for "(your brand of crank) (size)" or just take it to a Bike Shop and let them deal with it. You would need special tools for crank removal anyway.

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Your pedal falling off is never a good thing, nor is the entire crank arm assembly.

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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Left pedal stripped out

There are only two realistic solutions for this.

1) Replace the left crank arm that the pedal attaches too.

2) Insert a helicoil to replace the threads.

If replacing the left crank arm is not possible, then go the helicoil route. Either way this is best done through a bike shop as the helicoil system requires a good amount of mechanical knowledge and some specialized tools.

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I can not get the peddle off the crank. peddle part number fc-m500 crank set shimano sg

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