If you need to mount on both ends of handlebar, you need to order two pieces
Handlebar Mirro Installation Guide
This is really an update on an earlier review I did where my biggest issue was a lot of vibration. My mediation effort on this is that I took a pipe cleaner (my wife has these for her crafts) and wound it around the plastic stem connecting the mirror to the handlebars. I had hoped it would act as a vibration dampener and it most definitely did help. This "fix" was to simply wind the pipe cleaner around the stem covering as much of the spring as possible. It was a 2 minute fix that noticeably helped the vibration.
Huge amount of vibration. I have used "Mirror Cycle" ( picture https://www.icebike.org/what-you-need-to-know-about-cycling-mirrors/) and this seems to have much less vibration. I am working on some home-made vibration dampeners. The problems I see are primarily twofold: 1. The step connecting the mirror to the handlebars needs to better dampen vibration. 2. The mirror is a "stuff looks closer than it really is" type with a very good wide angle field of vision but, unfortunately, this exacerbates vibration. It is "OK" on newly surfaced pavement but that is extremely rare in Indianapolis Indiana an most of our residential streets in the city center that are decent for bicycling traffic wise are s shambles on the surface level.
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