Thank you so much!! Answers on demand!
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Hi Emily,
Love the questions. I have not encountered issues with dial fit systems in my experience evaluating head injuries and helmet protection (over the past ~13 years). Dial fit systems are on most traditional bicycle helmets, some bmx/skate style helmets. The geometry of traditional bike helmets is a bit different than equestrian helmets - they tend to be more prominent (pointy) at the back for aero purposes and they do not come as low as equestrian helmets at the back (in part because the testline for bicycle helmets (CPSC) is a bit higher than for equestrian helmets). So, an impact to the back of the head with bicycle helmet generally doesn’t involve the dial system since the helmet engages first. Also, the dial is below the most prominent portion of the occiput, making it recessed relative to the head and helmet. Most of this also applies to equestrian helmets. The equestrian helmets I’ve seen and worn have the dial recessed relative to the helmet so for a “typical” occiput impact, the dial system won’t engage. There might be exceptions out there and if they look to be an issue out in the field, would be worthy of some research attention. If you come across people having injuries specific to the dial system, I’m interested to hear about them.
Take care,
Stephanie
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For those just reading along who may not understand the significance, Dr. Stephanie Bonin, who posted above, is the ASTM Equestrian Helmet Task Group Chair and a Senior Biomechanical Engineer.
She has more helmet knowledge and direct experience than so many people. We are very lucky to have her here amongst us and willing to be a part of the conversations.
Em
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