MTB Gear Ratio is a free Android app developed by Ryland Lueders that provides mountain bikers with an easy way to calculate gear ratios, gear inches, and gain ratios. It is a useful tool for those who want to optimize their bike's performance and improve their riding experience.

The app is straightforward to use, and users can input the number of teeth on the chainring and cassette to calculate the gear ratio. Additionally, the app can calculate the gear inches and gain ratios by taking into account the wheel size and tire width. The calculated values are displayed in an easy-to-read format, making it easy to compare different gear combinations.

In summary, MTB Gear Ratio is an excellent app for mountain bikers who want to optimize their bike's performance. It is easy to use, and the calculated values are accurate and displayed in a user-friendly format.