The windscreen has to be either - big enough to deflect the turbulence they create over the rider at cruising speed - thus create a bubble - or they have to be small enough so that the turbulence strikes the torso and the helmet is in clean air.
If the 'dirty air' off the screen strikes the helmet it's unpleasant at touring speeds. In some combinations of helmet and screen - intolerable.
The taller you are the taller the screen has to be to fit in the bubble. Obviously the lower screen is in keeping with a motard.
For real tall guys like me windscreens are a complete pita. The only bike I would buy with a large windscreen now would be one that is electrically adjustable.
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