Originally Posted by http://jeff.dean.home.att.net/swisher.htm

The diagrams above show the impact areas on crash-involved motorcycle helmets. (Source: Dietmar Otte, Hannover Medical University, Dept. of Traffic Accident Research, Germany.) Note that 35% of all crashes showed major impact on the chin-bar area. This means that if you ride with an open-face helmet, you are accepting only 65% of the protection that could be available to your head.
I just want to interject in ya'll penis swinging contest with that. I can count on one hand the amount of times I hopped on a bike without my full face...sp yeah, I can empathize with liking the wind on my face from those few times. But it still makes it a bad idea.
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