Bicycle Mirrors

Mirrors come in several styles

1. Helmet mirror: These are small and light. Due to vision problems I have never been able to use these. Hence I am unable to give an objective opinion. However they seem ideal.

2. Frame mounted or bar mounted ( with straps ): I've had several frame mounted & bar mounted ( with straps ) mirrors. The most interesting mounted between my legs, I had to look straight down to use it. All of these mounts were unstable and allowed the mirror to moved, hence they never worked properly. 

3. Handlebar mounted ( attached with a allen bolt ): I used a Mirrycle about 10 years ago and fell in love. These are perfectly stable and can easily adjust to any angle. It can even be used as a bar end on the left side. The rest of the market is catching up by copying the leader. 

Overall helmet mirrors seem ideal if you can use them, otherwise go for a Mirrycle.