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Cycle helmet safety ranked by new Imperial research | Imperial News | Imperial College London
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stumbled across this old post and thought it might be useful to to leave this link: https://www.helmet.beam.vt.edu/bicycle-helmet-ratings.html
They have quite a bit on their site about the testing process if you're curious. Seems to be quite thorough.
That's a good list, I've seen it before and FWIW they have ratings for other helmets as well.