PORT CALCULATOR
Bike Gear Calculator
A precise tool.
What is the Bike Gear Calculator & How does it work?
Understanding bike gearing starts with the gear ratio, which tells you how many wheel revolutions result from one pedal revolution.
The ratio is calculated by dividing the number of teeth on the front chainring by the number of teeth on the rear cassette.
From the gear ratio you can derive gear inches, a measure of how far the bike travels per pedal turn, crucial for selecting the right setup for terrain and speed.
R = \frac{T_f}{T_r}
R = gear ratio (front teeth ÷ rear teeth)
Parameters
Result
—
Frequently Asked Questions
How do I calculate my bike’s gear ratio?
Divide the number of teeth on your front chainring by the number of teeth on your rear cog.
What is gear inches, and why is it important?
Gear inches measure how far you travel per pedal turn. It’s crucial for choosing the right gear setup based on terrain and speed.
Can I use this calculator for mountain biking?
Yes, understanding your gear ratio helps in selecting appropriate gearing for different terrains like mountains or trails.
How does changing the front chainring affect my bike’s performance?
A larger front chainring increases your gear inches, making it harder to pedal but covering more distance per pedal turn.
What is the difference between a high gear ratio and a low gear ratio?
A high gear ratio makes pedaling harder but allows for faster speeds, while a low gear ratio is easier to pedal but slower.
Can I use this calculator with multiple rear cogs?
Yes, you can calculate the gear ratio and gear inches for each rear cog to find the best setup for your needs.
What does a higher gear inch number mean for my bike?
A higher gear inch number means more speed per pedal turn but requires more effort to pedal.
Results are for informational purposes only and do not constitute professional advice.