Actually, they rate helmets every five years, so I would get an SA2000 (not just a 5 year old sa95). There is also a difference between M95 (Motorcycle) and SA95 (Autoracing) ratings. Then there is the whole Nomex fire retardent issue for autoracing...
p.s. (shameless plus) You can get them HERE...
www.dariusrudis.com/simpson
