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Why are bicycle helmets designed the way they are?
Seems like a BMX/Skating/Skiing helmet affords a lot more protection than the cycle helmets that just sit on the top of your head. I would think if you fall going 30+mph you would need a little more
But I don't bike, so what do I know
Like all quality sports equipment, helmets are sport specific. For biking a helmets weight, air ventilation, streamlining, protection, and comfort are some of the many design priorities. But all helmets must meet specific government safety specifications for their intended uses.
It would be safer to wear a down hill ski helmet or a motor cycle helmet, but we would die from heat strokes for lack of air circulation! The weight of those helmets would tend to throw us off balance and cause neck and shoulder muscle fatigue. Both dangerous conditions for bicycle riders.
I have had two helmet related accidents. The $200 helmets were both totaled. Cheap at twice the price! Interestingly, I would bet that the $90 bike helmets would protect me as well. The extra expense buys- lighter weight, more air vents, and better fit and retention systems (and some style points too).
Hope this helped to answer your question.
Soccerref
