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How to replace bike pedals
Secure your bike on a flat surface.
If your bike has a kickstand, rest your bike on it. If your bike doesn't have a kickstand, lean it up against a wall or a table so it stays upright.
Check the pedals to see what kind of wrench you'll need. Look at the space in between the pedal and the crank arm (the metal arm that your pedals are attached to).