[JessHerbst]

 I pass a lot of time watching motorcycle videos, MotoStars etc.
I notice that many of the FPV videos shot in sport bikes show the mirrirs folded in facing each other.
 Why?

[NVDucati]

I pass a lot of time watching motorcycle videos, MotoStars etc.
I notice that many of the FPV videos shot in sport bikes show the mirrirs folded in facing each other.
 Why?

My experience doing that was on enduro / dualsport bikes was to keep branches from killing  my mirrors.

[him a layin]

i expect the aerodynamic benefits (if any) are minimal.

[JessHerbst]

My experience doing that was on enduro / dualsport bikes was to keep branches from killing  my mirrors.

These are sport bikes on the road.

[NVDucati]

These are sport bikes on the road.

Then I could only guess they act as a bug-spreader when when out pacing the possibility of being passed.

[GlennF]

lane splitting ?

[Leofric]

These are sport bikes on the road.

Then they are idiots.

[AzCal Retred]

Obviously they are functioning as vortilon vortex generators for drag reduction...

https://en.wikipedia.org/wiki/Vortex_generator

https://en.wikipedia.org/wiki/Vortilon

https://en.wikipedia.org/wiki/Vortex_shedding

[Leofric]

Obviously they are functioning as vortilon vortex generators for drag reduction...

https://en.wikipedia.org/wiki/Vortex_generator

https://en.wikipedia.org/wiki/Vortilon

https://en.wikipedia.org/wiki/Vortex_shedding
[/quote
Most motorcycle screens in my experience seem to me to create an unpleasant vortex effect !