The height of a windshield on a Harley-Davidson motorcycle is largely dependent on personal preference. Some riders opt for taller shields to provide more wind protection, while others prefer shorter shields that allow more airflow and reduce noise levels. It is important to note that the higher the shield, the larger the blind spot when looking forward; however, it is usually possible to adjust the shield to a suitable height for any rider. Ultimately, it is best to experiment with different heights and find the right motorcycle windscreen for you.