This is a multi-purpose mechanical speedometer for bicycles or tricycles. It is bicycle engineering made of durable aluminum alloy. Small but light weight, functions as a bike speedometer and odometer, measuring both speed, distance and riding time. Pure mechanical bike code table, not only good quality but also accurate data. It only applies to 26 / 27.5 / 28/29 inch bikes. Check your bike size before purchasing. Our products have complete accessories and are easy to install. The bike speedometer is designed to be old school chrome circle style. Description: Color black. Scope of delivery: 1 piece bicycle speedometer. Main Material: Aluminum Alloy. Item Size:. Approx. (L x W x H). Gross weight: Approx.350g. Package including 1 piece bicycle speedometer Details Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.