Originally Posted by CigTech
The reason that bike helmets are better for cycling.
One: Bikes move faster then stakers. It only takes a 12 mph head strick to kill you. On Stakes most people only run at 12 to 14 mph. on a bike it's more like 15 to 25 mph. So Bike helmets have to be able to take a blow form a ridder hiting the ground at 25 mph. So there are thicker and will take a lot more then a stake helmet will.
What makes you think that a bicycle helmet is designed to protect against a 25 MPH impact? A helmet is unlikely to prevent serious injury if you suffer a direct head strike at that kind of speed. Of course, a fall at 25 MPH rarely involves a head impact at that speed, which is why a helmet is able to do any good at all, but they are certainly not intended to protect you from an impact at that speed. As for whether bike helmets are thicker and are better able to absorb a high-speed impact than a skate helmet, well... I rather doubt that.
A skate helmet is a poor choice for cycling, but not because a bike helmet offers more protection. They're just plain hot and uncomfortable when the going gets sweaty.