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polymers will degrade over time just sitting there. things like UV radiation, heat, airborne chemicals, ozone, bodily secretions, etc. chemically degrade the adhesives and the shells of helmets. It's a good idea to replace helmets every few years. If you're at the track, your helmet will not pass tech inspection, if it's obviously more than a few years old.

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How long is a life of a helmet that has never been down?
Also if a helmet has fallen off of a bike a couple of times should you replace it.

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