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					Originally Posted by JayG  Right you are for SA2005, M are not allowed, | 
	
 
M's are not allowed? Nobody (PCA Zone 8, and whoever runs Fontana and Big Bear) has complained about my M2015.
I bought an M because nobody in Ventura County carries SA.  For you guys who recommend buying in a store, where do you get SA helmets?  (Buying in a store is good advice; all the on-line sizing guides were wrong in my case.)
When I was into bicycling, the advice was to buy a new helmet every five years because sunlight attacked and weakened the plastics used in the shells.  Not sure if or how that applies to auto racing; I rode my bike 4K miles a year, so it was in the sun a lot.  Now? once a month is a lot.