Quote:
Originally Posted by Polski
In all the information and publicity concerning helmets, I have not seen any mention about the normal life expectancy of a helmet (assuming that they have not been dropped or had any impact). I have two, a 97 and 98 model, both DOT and Snell certified. Since that time, has the material for the outer or inner shells changed or improved enough where it would be wise to buy a new helmet.
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There is a fable out there that all helmets should be replaced after a certain length of time.
In the days of gel-and-paint fiberglass shells, when the gelcoat would crack and abrade the glass, a helmet would only last 4 - 5 years. However, polycarbonate shells WITH PAINTED EXTERIORS will last forever, unless there is visible damage. The only thing that degrades polycarbonate ("Lexan") is sunlight, and that takes decades even if the shell is unprotected.
The only part of the helmet which actually degrades by itself is the comfort liner, which can be replaced on the better helmets. The foam padding breaks down -- if you notice crumbled bits of foam, it's shot.
My rule is that if a helmet has done its job, protecting the wearer in an accident, it's history even if it looks brand new. If there is obvious damage, same thing.
However, if the shell is in good condition, and the liner isn't cracked, the only reason to replace the helmet is for features on the new helmet which aren't on the old one. I figure that my Caberg will do fine for the next couple of decades, or until I can't get replacement visors.
Or, of course, if it does its job.