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[BamBam]

Right, selecting a helmet that matches your head shape is very important.  Check out Revzilla's website.  They have good information on helmet sizing and you can filter the helmets by head shape.

https://www.revzilla.com/common-tread/how-to-buy-and-size-a-motorcycle-helmet

[Richard230]

This is my go-to site for helmet information.  Over the years I have found the reviews to be very accurate and unbiased:
https://www.webbikeworld.com/motorcycle-helmet-reviews/

[Shadow]

Schuberth helmet designs are quiet in an uninterrupted airstream;  any buffeting over the top of a windscreen will make it a loud experience. Probably worthwhile to borrow a helmet in the style you would like to try with your windscreen to know for sure.

[Zelidar]

.... I am getting less miles per charge percent after the windscreen than before.
... As I noted earlier, my riding has changed after the install.

Thank you very much for the report and the pictures. So assuming the riding style (mostly speed) would not change with the windscreen mounted we could see a range improvement of up to 10% ?  Any other remarks about using this windscreen now that a couple of weeks have gone?
Z.

[Moto7575]

Motorbikes burn kwh:
   - by accelerating (1/2.m.v^2)
   - by transmitting energy to the air (1/2.M.v^2 where M is the mass of air accelerated from zero to the speed of the bike)

If you are riding in a city (ie accelerate/brake more often than each couple of hundreds of meters) then the first term dominates.

If you are making long distances with limited use of your brakes, then the windshield will help you. The saving will be inversely proportionnal to the Cx increase. You can use this tool to estimate your gain : http://www.flowillustrator.com/
(you will need a drawing of the profile of your bike before and after).