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I've seen it said that when mounting things such as a light or camera on your helmet you want a breakaway mount so that in the event of a crash the helmet slides along the ground rather than snagging on it. What is it about these mounts that lets them break away?

  • Designed-in weakness. – Daniel R Hicks Dec 27 '17 at 3:36
  • Fragile plastic? Slender straps? Scoring a piece where it's supposed to give way? – compton Dec 27 '17 at 3:59
  • Whatever it takes. – Daniel R Hicks Dec 27 '17 at 4:00
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    Theres a bit more to it than just a fragile clamp. The item has to break away safely on a side impact as well as a direct frontal impact. A helmet-mounted camera is what exacerbated Michael Schumacher's skiing accident, by focussing the impact not dissipating it. – Criggie Dec 27 '17 at 5:34
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My Light and Motion helmet light has two built-in weaknesses that seem designed to fail on impact, tearing the light away from my helmet and not allowing any impact torque to transmit through to my neck:

  • The light and battery plastic mounts (the plastic-to-plastic connections) are intentionally weak and will pull away with very little force

  • The velcro that connects the mounts to the helmets isn't very strong and would tear if there was greater lateral force on them

I haven't tested the breakaways in an accident (and don't hope to) but I can say that the light and battery have released when I've hit them on low ceilings in my garage, to my chagrin.

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