If you are in the market for a new windshield then you might have found yourself overwhelmed by the sheer number of options when it comes to different sizes and shapes. Everyone is going to be different and no set of rules will apply to every rider so understand that these are general guidelines to get you close.

First, most manufacturers will measure a windshield from the top of the windshield in the center, to where the windshield goes into the Fairing. In other words, only the part of the shield that shows is what is measured. Detachable windshields are different and are usually either small, medium or large or something similar.

So What size should you buy? Great question but it's a complex one. Many things can affect what windshield size is best for the rider .. Rider height, seating position, low seat, riding two up, etc... In general, most riders want to look over the windshield by about 2 inches give or take. This would put the top of the windshield about even with the top of your chin. This will allow you to either look over the windshield or through it if you prefer.

Airflow from the Fairing and Windshield

Rule #1 ... You are riding a motorcycle. No matter how tall the windshield, some air will escape and find you! You cannot avoid it.

Aerodynamics is the key factor to controlling airflow and the Harley Davidson Fairing design has poor aerodynamics and the design is basically unchanged over the last 20 yrs. In addition, the front wheel acts like a rudder and splits the lower airflow to each side of the bike.

Another source of a lot of air comes in under the Fairing then upward towards the fuel tank. This airflow is what cools the motor and some of the air from under the Fairing will flow upwards and hit the rider in the chest or sneak up under your glasses.

The majority of the upper airflow from a HD Fairing is controlled by the Fairing shape...the windshield just continues it upward. This is why a Glide series with a 4 inch shield will make you feel like you're getting more air than a RoadKing with no windshield.

The shorter the windshield, the more air will "spill over" the top and hit the rider. The taller the windshield, the less amount of wind will hit the rider. Motorcycle speed will change the airflow dynamics ... the slower or faster you go, the airflow changes accordingly. If you want as little airflow as possible, then pick the tallest windshield you can live with.

If you want NO wind at all and prefer an airless environment... buy a full faced helmet and a Goldwing with a BIG shield !