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Originally Posted by racer
In essance, SA rating allows for multiple "hits" (like when you roll your car and your head hits the roof, windows, roll bar etc) whereas the non sa ratings are built for one big hit.
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Well, not exactly. This is an urban myth that seems to pop up every so often. MA and SA helmets are identical from a shock survival viewpoint - SNELL tests are the same for both. SA helmets are required to be fire resistant, and are lined with Nomex or similar material. Motorcycle helmet standard does not include the fire specification or testing.
In fact, some manufacturers produce an identical helmet in both SA & MA versions.
Please don't take this the wrong way Racer - its just worth knowing the facts about MA vs SA specs.
OG normally has a great range of helmets and good size spread in stock for most models. Bill's stock may be a little low this late in the season, but its a great place to start. Don't buy a helmet without trying it on and knowing it fits. The inital fit should be quite firm - the lining will pack down a little after a few brain bakes in the summer heat.