Applicable models Bicycle mirror for Orbea GAIN M31E 1X 20MPH 2023 Suitable for handlebars with an inner diameter of 22 25 mm. Please measure before . Compatible with all types of bicycles, including road bikes, mountain bikes, city bikes, electric bikes, etc. Construction and durability Composed of an aluminum base and a definition glass mirror for stability and durability. Convex real glass mirror provides a large, definition field of view. Nylon rods and coated frames help prevent damage. Designed to withstand wind and harsh riding conditions, offering long lasting reliability. Wider view and adjustability Curved, definition lens increases the field of view by 40%, helping you see vehicles and pedestrians behind you. 360 degree rotatable ball head allows easy adjustment to the viewing angle. Suitable for commuting in the city, cross country mountain riding, or leisurely riding. Installation and compatibility Includes a tool for quick attachment to most standard handlebars (22 25 mm diameter); no complicated assembly or additional parts required. Fits left and right. Quick installation, compatible with all models of use—whether commuting, cruising, or mountain biking. Use scenarios City commuting and road riding: maintain awareness of traffic behind you at intersections and in busy lanes. Mountain biking and cross country: monitor riders and obstacles on narrow trails and switchbacks. Long rides and daily errands: enhance rear visibility on highways, bike lanes, and urban routes.