just been reading some of the comments, yes helmets save your bonce, fact.
Fact: They reduce scull fractures.
Fact: They reduce lacerations and bruising to the face and head.
Fact: There is no real world evidence that I have seen that they reduce the chance of concussion and brain injury. I can show lots of data that show that increased helmet use does not lead to a corresponding reduction in incidence of concussion and brain injury. Where is the data that contradicts this?
if a helmet cracks then it has saved your head from being cracked.
The foam used in helmets is chosen to withstand compression in a test impact. However the effect of the tension, bending, and shear forces that the helmet will probably be subjected to in a real accident are not tested. As a result, helmet foam will absorb comparatively little energy when ripped apart. Try it with some polystyrene. It is extremely difficult so squash but can be easily puled, twisted, bent or ripped to pieces. In order to protect properly it would need to stretch, not crack.
The reason why it is used is because it is cheap and absorbs through compression across the wide range of temperatures and humidity levels required by tests.
i have read a lot of v.d. in this thread.
To say that people are talking v.d. without being specific and producing counter arguments is a complete cop out.
I say that the vast majority of helmets we all spend millions do protect but not against brain damage and concussion and that we are being conned into believing that they do.Where are the arguments and statistics to prove me wrong?
9/16" Suntour BMX MP-1000 pedals / 56 tooth TA 6-bolt chainring.(I'm not bothered if the teeth are worn or damaged)