For the avid cycler, choosing a high-
quality helmet is as crucial as having a solid bike. So it's surprising to hear that the main safety test for helmets hasn't changed since the mid-'90s—and isn't particularly true to the movement that happens in a real crash. What it involves: Strapping a 22-pound weight into a helmet and then dropping it straight down onto an anvil at 14 miles per hour. If the helmet curbs the force of impact to 300 Gs or lower, it passes.
But while testing hasn't gotten more sophisticated, helmet materials and technologies have. One leading brand, Smith, ups the ante to provide the cutting-edge protection. So what exactly happens when a helmet gets hit? Scroll and see.
Source http://www.popularmechanics.com/technology/a27081/how-bike-helmets-work/
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