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Log In or Register to post comments @jackcycles Your comprehensive meta-analysis seems to be missing some vital data, namely the mileage of each of the cyclists (it also misses out the speed but in its defence it does admit that) if the non helmeted cyclists ride over 3 times the distance per year of the helmeted cyclists then the helmets do nothing on a per mile basis and that is surely how we should normalise this data
The rule of thumb says that you should replace your dual sport helmet after five years of use
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