I'm an avid biker (own 4) and Divvy user. I'm in the group that rarely (if ever) uses a helmet on a bike share bike but always on my own bikes, and to be hones

I'm an avid biker (own 4) and Divvy user. I'm in the group that rarely (if ever) uses a helmet on a bike share bike but always on my own bikes, and to be honest it seems perfectly safe. The bikes are slow, very heavy with a low center of gravity and very easy to hop on/off of. It's difficult to fall off them in a way that a helmet would matter. Obviously a helmet is better than no helmet but the biggest time you'd need one on those bikes is if you get hit by a car. Avoiding the crash completely is the best bet there. Having more people on bikes (so drivers know to look) should do more for safety than wearing a helmet.