Rethreading crank arm
 

So I was riding my bike today and my pedal fell off and I was thinking to my self... what the heck happened and I found out that I didn't have my my pedal all the way on now the left crank shafts is half striped. How much is it going to cost to get it rethreaded?

The crank shaft or the crank arm is fubared?

Just take to a shop and have it fixed. Parts and labor rates vary all over the country. And then learn to visually inspect your bike before every ride.

Since the pedal fell off, it's reasonable to assume the OP is talking abouy stripped pedal threads in the arm.

Cost to repair depends on where the OP lives, and the shops in the area. Some are capable of fixing the crank arm with a thread insert or coil, while others will insist on replacing the crank.

To the OP.

1- take a moment now to add your location to your profile so someone might be able to give you a good referral local to you.
2- if there's a bike co-op in town that'll be your best yet. The next best bet would be an old style "bike shop", where they focus on repairs rather than high end new bikes.

Oops wrong person

Um well is the left crank arm the hole I put the pedal through is half stripped

I had you right the first time, and thus my reply about finding a shop that hopefully can fix it with a thread insert.

You mention the crank shaft being stripped so the question wasn't entirely clear. Depending on what make/model the crankset is and the extent of the damage, the arm could be replaced or repaired with a threaded insert.

Who installed the pedals? You are going to want to check the other one as well.

I did...... I saw where I made the error um bringing it to a shop tomorrow

Thread chase it. If that don't provide a solid repair either helicoil it or replace the crank arm.

For future reference:

The left crank's thread are reverse threaded.