Primero,
I have Davida jet. Size XXL (64 cm), similar to 7 7/8 (humungous!). I like the thinner outside profile, leather padding makes it comfortable and quiet. Had I been a professional helmet/gear moderator at the time of purchase, maybe I could have finagled a discount???? The first one (mail order) didn't fit due to giant head syndrome, but they took it back and this one fits excellent

. I thought that (direct exchange) was pretty decent of the vendor.
The other Bell thread has me thinking I might look for a second helmet.
JH