I am a little confused by this....if you are stating bike helmets would have to be more like motorcycle helmets to protect from more than one blow, this is incorrect.

Unless something with motorcycle helmets has changed in the past few years they are one bang items also.

Insurance companies agree....

I was in a motorcycle accident 3 years ago and when the insurance company began the claim on my bike, the first line item was $xxx for a new helmet. When I questioned why, they said that helmets were rated for one hard blow and would need to be replaced.

After a little research, I discovered back then that even if you dropped a helmet on the ground, you should replace the helmet.