【Design Feature】Mechanical bicycle speedometer designed to display riding data without electronic components or batteries.<br>【Measurement Type】Mechanical odometer structure intended to show total distance, single trip distance, and speed reference during cycling.<br>【No Battery Required】Non-electronic design allows operation without batteries, supporting consistent use in various riding conditions.<br>【Fit & Compatibility】Suitable for bicycles with 26 inch, 27.5 inch, 28 inch, and 29 inch wheels, for reference only.<br>【Material & Build】Plastic housing construction described for structural form and everyday cycling accessory use reference.<br>【Weather Reference】Water-resistant structure designed for use in different outdoor riding environments.<br>【Reset Function】Rotary reset button allows manual clearing of displayed data when starting a new ride reference.<br>【Handling Ease】Mechanical format and included accessories support straightforward installation on compatible bicycles.<br>【Usage Experience】Commonly used by cyclists to track basic riding information during daily rides or training sessions.<br>【Package Contents】Package includes 1 × mechanical odometer, 1 × cable, and 1 × adapter; contents are based solely on the supplied package.<br>【Measurement Notice】Measurement differences may occur due to manual measurement methods, and appearance may vary slightly due to lighting conditions and display settings.<br>【Value Statement】A thoughtful choice for users who appreciate positive community values.<br>