The Busch & Muller 801 Mirror was specifically designed for fast ebikes. This high-quality mirror is a shop favorite. It’s made in Germany by Busch & Müller. It protrudes out a little wider, but it has great visibility and it can fold in easily with its spring action joint. It mounts in the left side bar-end. Features Since there’s a right-hand thread as well as a left-hand thread in that stack, if the mirror is bumped from the front or from the rear, it can turn free on its threads. Then you can just tighten it back by hand after a brief chat with the nice bus driver. The long dimension of this mirror is 115mm. Inside diameter of the handlebar must be at least 16.7mm. The 801 mirrors have a ball & socket joint for making small adjustments to the mirror’s alignment. If that should ever loosen up, it’s easy to fix. You just need a medium size philips screwdriver. **The only difference from the 701 mirrors is that it sits up a bit higher