Agree with some of what you say, but have a couple responses.
\- it's unlikely that rotational forces are the only head-impact forces that cause concussions. A straight-on impact could still bounce your brain against your skull. That's why softer shells and cushioning tech like the safest helmets use (Leatt's turbines, for example) are important too.
\- rounder, smoother shells do matter. (All things being equal, smaller and lighter shells matter too.) That _is_ being addressed in MTB helmets. Just compare the rounded shape of newer Kali and POC helmets with the edgy shape of a Fox Flux, or all the pointy-in-back designs popular 5 years ago.
\- break-away visors and accessory mounts for lights and cameras matter, too. Probably a lot. Magnets obviously are not the only way to make something breakaway. Many newer designs address this.
\- we all know that no helmet can prevent every concussion. No helmet can prevent a no-impact concussion. But safer helmets can prevent a lot _more_ concussions.
March 16, 2019, 9:06 a.m. - OldManBike
Agree with some of what you say, but have a couple responses. \- it's unlikely that rotational forces are the only head-impact forces that cause concussions. A straight-on impact could still bounce your brain against your skull. That's why softer shells and cushioning tech like the safest helmets use (Leatt's turbines, for example) are important too. \- rounder, smoother shells do matter. (All things being equal, smaller and lighter shells matter too.) That _is_ being addressed in MTB helmets. Just compare the rounded shape of newer Kali and POC helmets with the edgy shape of a Fox Flux, or all the pointy-in-back designs popular 5 years ago. \- break-away visors and accessory mounts for lights and cameras matter, too. Probably a lot. Magnets obviously are not the only way to make something breakaway. Many newer designs address this. \- we all know that no helmet can prevent every concussion. No helmet can prevent a no-impact concussion. But safer helmets can prevent a lot _more_ concussions.