This Bicycle Computer Mechanical Analog Bike Cycling Odometer Speedometer Equipment is perfect for keeping track of your cycling progress. With the ability to measure your odometer, as well as being waterproof and made from aluminum, this bike computer is ideal for cyclists of all levels. It works for 26/27.5/28/29 inch bikes only, and comes with a 6 month manufacturer warranty. The black color and vintage style make it a stylish and functional accessory for your cycling needs.