I bought one of their aluminum h-bars cos they were 22mm and fit on the yoke properly. When I found my old (cheap) bar end mirror wouldn't fit into the small bore of the bar, I ordered a Rizoma mirror. When it arrived, I was shocked to see how small it was. Good thing it's convex glass. I'm amazed at how useful and clear the view to the rear is! It's like a video monitor, I tell folks. Once the Lemans fell off its horrible side stand right onto that mirror and the windshield broke but the mirror has only a couple scratches on the back, so it's strong too!