content: And after a mile of riding after mounting this, I wondered how I could have ever lived without rear view mirror on my bike. The only "con" is that it is very difficult to mount (you do need lots of strength to tighten it up), but it's also a plus because one it's on, it stays one (you really don't want the mirror to swivel or move every time you hit a pothole or go over a bump). I've dropped my bike a few time and the mirror did not break.