HIGH-QUALITY ALUMINUM ALLOY MATERIAL: This is a very classic bicycle speedometer with high strength, rust resistance, and durability. This is a universal mechanical speedometer for bicycles or tricycles. It is a high-quality bicycle equipment made of durable aluminum alloy. MORE INTUITIVE CLEAR DATA: This bicycle meter uses a mechanical stopwatch to show your riding speed and make your riding speed change more intuitive; The data on this bicycle meter is very clear, using the rotation of the pointer to show your speed changes. . ACCURATE DATA: Pure mechanical bicycle computer is not only of good quality but also accurate data. You can get bike data with this smart bike computer. EASY TO INSTALL: Our product accessories are complete and easy to install, and easy to install securely with the mounting accessories. You can do it yourself; Installation conditions: You need to have a quick disassembly rod or a large front wheel gap to be installed. SUITABLE:Ideal for general bikes, road bikes, mountain bikes, folding bikes, electric bikes. Shape: Round/square Weight:336g(round)/342g(square) Quantity: one piece Color:black