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I would think if Snell is claiming they need to be replaced they would have some test data to back that up. It would be pretty easy to test a bunch of old helmets and see how fast they really degrade and see how much scatter there is in the data i.e. do some helmets last 10 years and others show serious degradation in 5.
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It isn't the conditions its the decisions
Don't bring a motorcycle to a car fight
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