"If the price is a problem, you can get a Snell M-rated helmet for much less
than the SA helmets -- both are legal for Solo II. The primary difference is
in fire resistance --
The other difference is M helmets are rated for one impact while SA's are rated
for multiple."
Actually, from the Snell web site:
What are the differences between the SA and 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.
The capacity for impact protection is determined by direct measurement of the
shock delivered through the helmet to a headform when the helmeted headform is
dropped in a specified manner onto any of three unyielding anvils. A fourth
anvil is used to test impact protection for repeated strikes against a roll
cage assembly."
http://www.smf.org/standards/sa95std.html
Bob
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