Bicycle Calculator (BikeCalc) is a calculation helper app for bicycle enthusiasts and professionals. This app, developed by Christoph Galle, is currently available for Android devices running on version 1.6 or higher. It provides a comprehensive set of features to calculate spoke length, chain length, tire circumference, gear inches and transmission ratio, shifting capacity, and frame size. The app is still under development, and more features are expected to be added in future updates. The main menu can be accessed through the menu or the back-button. However, there is no information available about the developer or how to contact them. Overall, Bicycle Calculator (BikeCalc) seems to be a useful app for bicycle enthusiasts and professionals alike, and it is worth trying out.