I bought a nice BiKase mirror for my new touring righ bike but, the clamp cannot work with handlebars >28mm diameter.
I have to return it and am rethinking a bike mirror. Maybe I do a helmet mirror instead. I used one on my road bike but, I like a larger mirror.
A lot of pics of bikes I see in the forum don't seem to have handlebar mirrors showing.

What do folks like to use?