Originally Posted by
groth
I have a helmet mounted mirror. It works well, but it still has a blind spot: just to the left rear of me. Most cars I can hear, but slow moving (electric?) cars are problematic as well as cyclists that don't give an on your left! So, I always glance around before moving left.
I don't get how could you possibly have blind spot on your helmet mirror.
I also use helmet mirror and don't have issues with blind spot. Obviously, you have to pan your head a little bit to have full view of the rear with that tiny mirror. They're expected to be used in such manner.
Of course, compared to not having any mirror, you have to pan your head all the way to the back to see behind you, losing front view. With helmet mirror, you only pan a little bit without losing front view on your peripheral vision. It's a massive improvement of rear view, otherwise, I would not have bothered having a pointy thing attached to my helmet.
I find helmet mirror better for cycling. The mirror is smaller and lighter and comfortably within forward view, you don't have to look down (as you would with handlebar mirror) and have better coverage of rear view.