Anyone ever heard that helmets lose strength over time and should be replaced every 6-10 years?
Your Shoei helmet is covered under warranty for five years from purchase date or seven years from the date of manufacture, whichever comes first. The warranty covers all manufacturing defects. Please note that damage caused by the consumer, (i.e. dropping the helmet), etc., is not covered under warranty.
a helmet is not food or drugs. there are a lot of variables with that. how often ones rides, climate, where the helmet has been stored, etc. but the foam will harden with age. if the foam does not compress under impact then its virtually useless, otherwise might as well wear a helmet made of solid wood.Like drug and food expiration dates, my bet is that they are actually geared toward more profit for the manufacturer. Got bounced out of tech last trip to the drags for expired seat belts. Meanwhile, In the army we humped with 40 year old parachute harnesses.