Made of aluminum alloyAccurate data with pure mechanical systemFits 26/27.5/28/29 inch bikesEasy to install with complete accessoriesEssential instrument for your biking journeySpec:Features:This is a or tricycle general mechanical speedometer, it is a high-quality equipment made of aluminum alloy. Pure mechanical 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 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 journey, and you'll find it useful.Specification:Condition: Brand NewMaterial: Aluminum AlloyColor: BlackSize: Approx. 11 * 8 * 8 cm / 4.3 * 3.1 * 3.1 inWeight: Approx. 333 g Installation Conditions: A quick release lever or a large front wheel clearance is required for installation.Package List:1 * ComputerNote: Only the Computer, others are just Photography Props.