The Busch & Muller Cyclestar 913 Mirror was specifically designed for fast ebikes. This high-quality mirror is a shop favorite. It’s made in Germany by Busch & Müller. Cycle Star E has a large, five-sided convex mirror for a very large field of view and a fold in mount. The long dimension of the mirror is 124mm. Left side mounting only for upright bar on E-Bike. The inside diameter of the handlebar must be at least 16.7mm.