Bike Gear Ratio Calculator
Calculate gear ratio and gear inches for your bicycle setup
About this calculator
A bike gear ratio calculator helps cyclists determine the mechanical advantage of their bicycle's drivetrain by calculating the ratio between chainring and cassette teeth, plus gear inches for speed analysis. This tool is essential for optimizing performance, whether you're climbing steep hills, sprinting on flats, or finding the perfect cadence. Understanding gear ratios allows cyclists to make informed decisions about component upgrades, training efficiency, and bike setup for different riding conditions and terrain types.
How to use
Enter your chainring teeth count (front gear) and cassette/rear cog teeth count into the calculator. The tool will instantly compute your gear ratio and gear inches. Compare different combinations to find optimal gearing for your riding style, terrain, and fitness level.
Frequently asked questions
What is a good gear ratio for climbing?
Lower gear ratios (1:1 to 2:1) are ideal for climbing steep hills, providing easier pedaling with less resistance.
How do gear inches relate to speed?
Higher gear inches mean greater distance traveled per pedal revolution, resulting in higher speeds on flat terrain.
What's the difference between gear ratio and gear inches?
Gear ratio is the mathematical relationship between gears, while gear inches factors in wheel size for practical distance measurement.