I am actively looking for a bike mirror to use on my commute. I saw this one on Amazon and was intrigued. In the picture below the flap is closed concealing the mirror.
Here is is with the mirror opened. This is the standard way to wear it with the mirror sitting on your wrist.
This is the way that worked for me. I have it on riding over the backside of my palm and canted at an angle.
It works but it does have issues. I have a huge blind spot no matter how I angle or wave my arm around in an effort to try to see what is close behind me. I had one big delivery truck thirty feet in back of me and couldn’t see it. I could hear it though. I could only see it using the old school method of simply turning my head. The mirror definitely needs to be a little bigger, and it also needs to magnify the image more. Stuff looks pretty far away back there.
Tomorrow I am riding my hybrid. I am anxious to see what happens without the drop bars. Will the straight bars, and the geometry of that bike make a difference? Useful, but not the solution I was looking for.
I have one intersection that is very busy when I come home, and cars drive fast. There is a bike lane, but I to make a left turn in front of whatever is behind me, and whoever is oncoming as well as deal with people merging one direction or the other from the street I am trying to turn onto. Often I just pull to the side and look. Turning the head doesn’t work so well in this situation.
The other area where I would like a good mirror, which has lots more traffic than the aforementioned intersection, is downtown. Other than that, except for a detour while there is some bridge construction, is the trail. Most of my ride is on a trail that is free of traffic except for other bikes, and people on foot.
I used a helmet mounted mirror years ago and I was not a fan. I am going to try it again, and just work with it until I get used to it. That is the plan anyway.