I am about to start commuting to work in Orlando, FL. It is about six and a half miles each way. I am in my early thirty's and just started riding again. I ride a '06 Specialized Rockhopper. I haven't seen anyone riding a MTB wearing a helmet. Usually it is just the Roadies wearing them.

My commute is almost entirely on residential side streets. I have to cross, but not ride on one major street.

So should I wear one? I have a brand new one, and it is just a matter of slapping it on.