>The study in your link does not answer (that I saw) the question I had: how common are bicycle accidents that cause head injuries in the first place? My guess / assumption is not very. No question that if it should happen you would be better off wearing a helmet. I just don't think the chances of it happening are enough to worry about.

Here's some more data: http://www.helmets.org/stats.htm

Seems to me that helmets are an easy, inexpensive way to save lives and prevent injuries. (Kind of like seat belts.) Pardon the expression, but it's a no-brainer to me.

Tamar