Official The370Z track accessory thread (helmets, racing suits/gloves etc)

[dkmura]

Originally Posted by The HACK

Don't know why SA helmets typically run more expensive than M helmets, most likely due to economy of scale would be my assumption. There are more motorcycle riders needing helmets that pass the Snell M standards, than there are car enthusiasts/race car drivers that will need Snell SA standard helmet. And there are subtle differences between the two standards, I believe M helmets are subject to higher impact loads while the SA helmets must meet certain fire proofing standards. Both standards are listed somewhere on the intarweb.

SA-rated helmets must pass multiple impact tests that M-rated helmets do not. Snell ratings are based on their use, and Special Application (SA) helmets are typically used for auto racing. In the event of a major car crash (vs. a bike crash) there's a higher chance of multiple impacts (ie. rollovers) in which the helmet needs to protect the head repeatedly. The M-rated helmet is rated to take one major impact only. As you mention, a fire resistant interior is part of that rating, but if you ever need THAT, you're in bad shape already! Passing those tests adds up to a more expensive helmet!