How can I accurately measure a bike stem for proper fit and alignment?

To accurately measure a bike stem for proper fit and alignment, follow these steps:

1. Measure the length of the stem from the center of the handlebar clamp to the center of the steerer tube clamp.
2. Measure the diameter of the handlebar where it attaches to the stem.
3. Ensure the stem is aligned with the front wheel and the handlebars are at a comfortable angle for your riding position.
4. Consider factors such as reach and height to determine the best fit for your riding style.