There's a thread on here of mine describing an experiment dropping my helmet onto solid concrete with a bag of sand inside.atoz wrote:It doesn't take that much force to deform a cycle helmet .................
I dropped it twice from head height before it even became damaged.
viewtopic.php?f=41&t=79382&start=75
I weighed my head, and put the same? weight of sand in a bag, then dropped my helmet ...................................