EASY TO INSTALL: This product accessories are complete and easy to install, you can do it by yourself without any effort. Installation Conditions: A quick release lever or a large front wheel clearance is required for installation. ACCURATE DATA: This cycling automatic pure mechanical bike computer, not only has good quality, but also has accurate data. SUITABLE BIKE SIZE: This speedometer works for 26/27.5/28/29 inch bikes only, be sure to check your bike size before you buy it. DURABLE ALUMINUM ALLOY MATERIAL:This product is a bicycle or tricycle general mechanical speedometer, it is a high quality bicycle equipment made of durable aluminum alloy. GOOD BIKE JOURNEY: This cycling computer is the must instrument you should need for your bike journey, and you'll find it useful.