Bicycle Gear Calculator is a very powerful application for serious cyclists. It will not only calculate a bicycle's gearing, but will also save the information for later retrieval. Measure the wheels, enter the gear numbers, and Bicycle Gear Calculator will calculate the gear ratio's. The measurements can be made with inches or centimeters, and can be displayed in both, as well as in US and Metric Standard Gearing. Enter the cadence and it will display the Estimated Speed in mph or km/h.