I went down to the local Cycle Gear and tried on several Bilt street helmets. I wear an XXL, and every one of them was too small. A couple of months later I was ordering some stuff from motorcyclesuperstore.com, and decided to order an HJC CL-16 in XXL, figuring I could return it if it did not fit. Turned out to be one of the best fitting helmets I've ever owned.
2002 Vulcan 750, 2001 XT225
2008 Vino 125, 2009 Genuine Stella
2012 Zuma 125, 1980 Puch Newport moped