Originally Posted by
MikeElBike
WRT to a helmet mirror that cyccomute mentioned: is it stable enough in terms of vibrations ?
Stable enough to be used while mountain biking. Very early on, I tried handlebar mirrors and found them to be impossible to use because of the vibration from the road. A helmet mirror simply doesn’t vibrate because you head doesn’t usually vibrate all that much. The other advantage of a helmet mirror is that I can easily turn my head to increase the field of view behind me which isn’t something that is easy to do with a handlebar mirror and even less easy to do with a mirror mounted further in on the bike.