MECHANICAL CODE TABLE - This bike counter uses a mechanical stopwatch to display your riding speed and make your riding speed more intuitive. * Note - This bike is suitable for 26 / 28 / 29 / 27.5 inch bicycles. * Clear data - The data on this bike counter is very clear, with the rotation of the pointer you can display your speed changes. The speed range supports 0-60 km/h. * High-quality materials - This bike counter is made of high-quality aluminium alloy and is of high quality and durable. * If you have any questions about our products, you can contact us for more information about the products. Product description Specification: Item Type:Bicycle Speedometer Suitable for: 26 / 28 / 29 / 27.5 inch bicycles. Color:Black Material: aluminum alloy Bayonet size: approx. 2cm Display accuracy: 0.01s Waterproof: Yes Weight:340g Box contents: 1 x Bicycle Speedometer