My teenage son recently started bicycling a lot less. My wife and I both cycle and we're disappointed to see this. It has taken me some time to sort out what happened, but it turns out a kid at school was teased about wearing a helmet on bike to school day. We've strictly required him to wear a helmet and he's decided he'd rather not ride his bike than wear a helmet.
I'd really like him to bike and I'm considering letting him bike without the helmet. I'm trying to sort out how dangerous it is to bike without a helmet. From what I can sort out it seems that biking without a helmet is approximately as dangerous as riding in a car without a helmet. Am I underestimating the risk?