3 ms·
Are you sure? I have about one accident per year when using my bike a lot in an urban area (20km/d). Only luck prevented me from landing on my head - if I had,
by netrus 13y ago
Are you sure? I have about one accident per year when using my bike a lot in an urban area (20km/d). Only luck prevented me from landing on my head - if I had, I am pretty sure the helm would have been pretty helpful. Plus, a good helm is available for as little as 15USD. Considering the cost of falling on my head, that appears to be a good deal.
btw: In my last accident in a urban setting, I came down 3-4m away from my bike. And it did not involve any car, just me poorly performing an emergency break at about 20-25 km/h
- bryanlarsen 13y agoMost people who claim that bike helmets aren't particularly useful in an urban setting usually say they aren't particularly useful below 20 km/h or in collisions with cars. Above 20 km/h helmets are useful.
- Cushman 13y agoSounds like junk science to me. Just cribbing from Wolfram here: http://www.wolframalpha.com/input/?i=gravitational+potential+energy+of+75kg+at+1.5m http://www.wolframalpha.com/input/?i=gravitational+potential... ...energy of 75kg at 1.5m = 1.10 kJ http://www.wolframalpha.com/input/?i=kinetic+energy+of+75kg+at+20kmph http://www.wolframalpha.com/input/?i=kinetic+energy+of+75kg+... ...at 20kmph = 1.15 kJ That is to say, your head is likely to experience roughly the same force when riding head-first into a brick wall at 20kmph as falling head-first onto pavement from a high seated position, but one of these can happen at any speed.
- bryanlarsen 13y agoI think the point is that below 20km/h is a speed that evolution has experience with. At those sorts of speeds your instincts are going to do a lot to protect your head: throwing your arms up, for example. The arms might break, but your head will be somewhat shielded.