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. Dec 27, 2017 at 3:36
  • Fragile plastic? Slender straps? Scoring a piece where it's supposed to give way?
    – compton
    Dec 27, 2017 at 3:59
  • Whatever it takes. Dec 27, 2017 at 4:00
  • 2
    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, 2017 at 5:34

1 Answer 1


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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