How to adjust a bike helmet for the best fit and safety?

To adjust a bike helmet for the best fit and safety, follow these steps:

1. Position the helmet on your head so it sits level and covers your forehead.
2. Adjust the straps so they form a V-shape under your ears and are snug but not too tight.
3. Buckle the chin strap and tighten it so you can fit only two fingers between the strap and your chin.
4. Make sure the helmet doesn't move when you shake your head.
5. Check for any gaps between the helmet and your head, and adjust the sizing pads if needed.
6. Finally, do a final check to ensure the helmet is secure and comfortable before riding.