Quote:
Originally Posted by Alistair
UV and general wear/tear degrade the foam in helmets. No idea if 3 years is a reasonable lifespan or not. I’ve heard manufacturers recommend that replacement interval, but it always stuck me as a bit like the old 3k mile oil change intervals for cars - overly conservative, and likely not optimal for consumers. That said, I replace mine every 3-5 years, they usually look pretty beat by then anyways.
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Yes, those things can degrade the foam. A helmet in a box on a shelf experiences neither of those things though.
Whether the helmet was made 1 day ago, 1 month ago, or 1 year ago shouldn't matter if the helmet is sitting in its box on a shelf.
@peanutgallery seems to say it does matter.