Mirror preference is a personal choice, but I prefer the bar mount mirror. My wife and I are primarily touring cyclist, although we also ride road bikes. We ride year around for fun or getting ready for a tour. We have mirrors on our touring bikes, but not on our road bikes.

IMO the disadvantages of the helmet mount mirrors are: 1. They are in the way of a helmet cover. We do a lot of riding in the rain, and the helmet covers go on and off regularly; 2. They are relatively fragile. We pack our bikes and gear, including our helmets, for transport on buses, trains and planes; 3. I really don't like them in my field of vision.

Pretty much the same with glasses mounted mirrors with the addition that they do not seem practical when switching from my regular glasses to sun glasses several times a day, or when putting glasses in a case.

We have tried 3 different bar mounted mirrors: Mirrycle, Blackburn, D+D Oberlauda. Mirrycle is the one we prefer. It fits well is sturdy swings out of the way when parking etc, and is easy to mount or install when packing the bike. The mirror is about 3" in diameter, giving a wide field of view without making objects very small. The Blackburn was second, and my daughter uses one on her Long Haul Trucker.

Mirrycle mounted on my wife's touring bike.


As far as the visual scan- I don't trust the field of vision of any mirror, either driving or riding.