I use one when I ride on public roads. When attached to my helmet, I sometimes have problems seeing behind me and often have to move my head around until I can the mirror in the right position. I attach the mirror with industrial Velcro so it is easily detached when I don't want to use it. Depending on the mirror, there are only so many positions that you can adjust it to. My mirror is the Third Eye Pro, which seemed to have the largest viewing area of the others I looked at.
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