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Recommend me one.
I use the one marcski recommended. You can buy it here or in some bike shops.
http://www.amazon.com/Bike-Peddler-Cycling-Eyeglass-Mirror/dp/B001VTQNVO
It gives a great field of view and it isn't heavy . No problem attaching it to my Rudy Project bike glasses. I wouldn't ride without it. I guess I'm a Fred.
Get the original model, the compact is too short and it's difficult to adjust.