The Mountain Mirrycle mounts in minutes with the wrench that is included. The mirror is a 3" round, convex glass mirror with a wide field of view. It works best with twist shifters, as it plugs into the end of the handlebar. It is not compatible with bar-end shifters.
To extend the mirror out more for a better sight line, especially on trikes, use the Mirrycle Mirror Extension in conjunction with the Mirrycle Mirror.