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If it is the pedal's threads that are stripped just purchase a new pair. If it is the threads on the crank that the pedal goes into then either replace the crank arm if it's the left side or find a bike shop that can install a "Helicoil" to repair the crank. Threads will be stronger than the original
1. replace the crank.
2. Purchase a Heli-Coil or other brand at an auto store. It looks like a tube with threads on both sides that will screw in to the stripped hole and there by install new threads. Bring the pedal to the auto store to make sure it will thread in to the "female" threads on the Heli-coil.
The problem is the pedal is steel and the crank arm is soft aluminum. Also, people damage them because one pedal is normal thread and the other is reverse thread meaning you turn clockwise to loosen.
You will need to have that crank arm replaced. They do make repair threads, but the price to install is just as much as replacing the crank arm. Your local bike shop can provide the correct parts.
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".
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.
If the thread on the crank arms that hold the pedals are stripped, you will need a new set of cranks. That is definitely a job for the bike shop. Make sure the pedals are snug in the arm, Right side pedal has right-hand thread, left side (looking down when you are on the bike) has a left-hand (reverse!) thread.
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.
All depends on if you stripped the crank arm, you may have to replace your crank arm if you rode with a loose pedal. Pedals are sold in pairs, and there are 2 sizes, a one piece crank is 1/2" and 3 piece crank is 9/16", take your bike to the bike shop and they will tell you if you need a new crank arm or not. It will do no good to just replace your pedal if there is a bad crank arm thread, it will not hold.
You have to have a pedal wrench and they pedals have a right thread right side and a left thread the left side. The right side is the chain side, to tighten either one, you put the bike in front of you and turn the pedal wrench towards you to tighten, to loosen turn the wrench to the rear. This is very important, do it wrong and you strip your crank arms. Pedals are marked R for right side, L for left side. It is important to know this information. Most manuals do not tell you.
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.
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