First look at ratings.
Auto racing helmets are rated by Snell as either SA, M, or K...
Snell SA Rated Helmets:
Snell "SA" (Sports Application) rated professional helmets are designed for auto racing and provide extreme impact resistance and higher fire protection.
Snell M Rated Helmets:
Snell "M" (Motorcycle) rated helmets are designed for motorcycling and other motorsports. They offer slightly less protection than SA rated helmets.
Snell K Rated Helmets:
Snell "K" (Karting) rated helmets are designed for Karting applications. They are subjected to the same test standards as SA helmets except the do not require a fire retardant interior.
What are the key differences between SA and M Rated Helmets:
- SA standard requires flammability test while the M standard does not.
- SA standard has rollbar impact test while M standard does not.
- SA standard allows narrower visual field than M standard (Some SA helmets aren't street legal).
Some SCCA clubs, especially smaller ones will allow M rated helmets. Big more organized ones, such as Denver usually with check your rating. That also do at Nationals and at Track days.
It's all comes down to one thing! What is your grape worth to you? I saw what was left of an M rated helmet in a Miata rollover.
2012 Evora 2+0 IPS.
2007 Exige mental track toy.
"Listen up, I ain't Captain Walker. I'm the guy who carries Mr. Dead in his pocket."
"CHARLIE DON'T SURF"