Features: This is a bicycle or tricycle general mechanical speedometer, it is a high-quality bicycle equipment made of durable aluminum alloy. Pure mechanical bike computer, not only has good quality, but also has accurate data. It works for 26/27.5/28/29 inch bikes only, be sure to check your bike size before you buy it. Our product accessories are complete and easy to install, you can do it by yourself without any effort. The must instrument you should need for your bike journey, and you'll find it useful. Specification: Condition: Brand New Material: Aluminum Alloy Color: Black Size: Approx. 11 * 8 * 8 cm / 4.3 * 3.1 * 3.1 in Weight: Approx. 333 g Package List: 1 * Bicycle ComputerNote: Only the Bicycle Computer, bike others are just Photography Props.