The vented Airoh looks interesting but there are no close dealers where I can try one for fit. Can anyone comment on the inside shape? Is it like the old Bieffe or more like a Shiro? Or....

Been a long time since I owned a Bieffe but it fits more egg or square than some helmets

Round like old Bell did not work for me not did my Wolf helmet fit my head, so it's not like them

I'm pretty happy with my Airoh

Not far off a shoei, similar to a mots in fit I guess, or a hebo. Try before you buy!

seem to run small as well

yes maybe smaller, xl equals a L? Try before you buy! or ask for s o return?

Ahh yes, I forgot, Shoei and Arai fit me very well and so does this Airoh, but ya, I had to use XL instead of L