What is the shortest wind deflector I can put on a Road Glide, without the wind hitting me in the face.

 

Well, that would totally depend on how tall you sit in the saddle!

As you ride with what you have now, hold your hand above your head and find where the air flow is. Whatever distance that is above your head, you should be able to subtract from the height of your current windshield.

Or, you can go to custom shields like the ReCurve that has a deflector on the edge of the shield.

 

Duh! I forgot the most important info. 5'10"