How do I replace the crank arm on my bike?

To replace the crank arm on your bike, you will need to first remove the old crank arm by loosening the bolt that attaches it to the bottom bracket. Once the old crank arm is removed, you can then attach the new crank arm by aligning it with the bottom bracket and tightening the bolt securely. Be sure to double-check that the crank arm is properly aligned and tightened before riding your bike.