Hi Roberto, I'm in the same catagory, bighead. Mostly bone for me though. ;^)
I've been wearing a HJC helmet, size XXL. Believe it or not, there was actually one size larger than that that I tried on. It was loose! So, while I'm not aware of any custom sizes, you may want to give the HJC a shot at your favorite mc shop. I'm gonna be needing a new lid pretty soon myself, so let us know what you find out. Have you tried contacting any of the manufactures directly yet to let them know of your needs? Considering all the 'pros' that wear their helmets, they have got to have some kind of a 'custom' size/fit dept. to handle all those various head sizes. Good luck, Brandon (and not one SA remark.....barely.....)
