What are the differences between snell SA and snell M standards?
SA Standard was designed for auto racing while M Standard was for motorcycling and other motorsports. There are three major differences between them:
1.SA standard requires flammability test while the M standard does not;
2.SA standard allows narrower visual field than M standard (Some SA helmets may not be street legal);
3.SA standard has rollbar impact test while M standard does not.