Features: 1. Made of aluminum alloy material, lightweight and durable. 2. It works well to measure speed, distance, riding time. 3. Big backlight screen for easily and clearly reading all riding data especially when in a dimly lit. 4. Suitable for 26in, 27.5in, 28in and 29in bicycle handle wheels. 5. This bicycle mechanical odometer is waterproof and durable and can be used for a long time. Description: Pure mechanical code table, good quality, accurate data, is a practical bicycle equipment. Specifications: Application: for 26/28/29/27.5 Inch Mountain Road Bike Material: aluminum alloy Package Included: 1 * Bicycle Speedometer 1 * Cable Wire 1 * Speedometer Bracket 1 * Rubber Gasket Notes: 1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object.