02-15-2008, 11:02 AM
It is my understanding that the only physical difference is that the chin strap on an M helmet is not fire proof. I believe that testing M helmets for a Snell rating is one impact vs. multiple impacts on a motor sports helmet. The idea being that a motorcycle helmet will only have to take one big impact when the rider falls vs. the race car driver's helmet hitting the roll cage several times.
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