Riporto quanto trovato nelle faq del sito Shoei: pare che anche i piccoli urti possano essere dannosi.
Is a crashed / dropped helmet still safe to wear?
Current safety helmets are designed to absorb the energy of an accident by being destroyed. Even a small impact can damage the integrity of the shell or the inner liner. Quite often this damage may be unnoticeable to the untrained eye. Therefore, any helmet involved in an impact should not be used again.
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r1100s
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