Mechanical Speedometer Universal Classical Bike Cycling Odometer Stopwatch Waterproof Bicycle Tachometer Gauge for BicycleFeatures:Waterproof and anti-shock function can be useful, suitable for most kinds of surroundings.Easy installation and simple operation, it's precise and always indicates accurate data for drivers.Speedometer diameter: 8cm. Wire length: 70cm.Good bicycle stopwatch provides odometer clock and speedometer function, more useful.Specifications:Color: blackWeight: 340GMaterial: ABSApplicable to: 26 28 29 27.5 inch carPackage included :1pc*Mechanical Speedometer.Notes:Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures.Please allow slight dimension difference due to different manual measurement.'