useful life of a helmet
I've been going around and around on this the past week after re-reading a MCN article where the writer related that neither the helmet manufacturers or Snell would provide any data regarding the "five year rule" and, in fact, shot down his suggestion that an experiment be done.
It would seem that anybody who was going to say "do this" might have some data to back it up. But then you get into the variables: storage and treatment of the helmet, the types of cleaners used, the amount of use in a year, etc. etc. And then there's the liability issue. So all that adds up to an unwillingness to make a firm statement regarding things that they can't control and would probably be sued over.
Then there's the fear factor, or risk management, or whatever. I've got a Shoei Multitec and my wife an HJC. We had older Shoei XSP-II and an RF900. Those had the liners fall apart to the point where they were a nuisance to wear. Tossed them in the trash. But the HJC and Multitec are going strong, apparently. We've decided to keep on going with those. Might be putting money ahead of sense here but two Neotecs would set us back $1200 and we aren't going there right now. Then again Helmet Shop has a deal on Multitecs so $400 might be OK. But then how long have the Multitecs been sitting on the shelf. Too many factors to consider....