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HOMECyclingBike Gear Ratio Calculator
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Bike Gear Ratio Calculator.

Analyze gear ratios, gear inches, skid patches, and development meters for bicycle drivetrains.

FREE INSTANT RESULTS NO SIGNUP UPDATED 2026

Parameters

T
T
in

Summary Output

Gear Ratio
3.00
Gear Inches
81.0 in
Skid Patches (Fixed Gear)
1

How to Use

Enter front chainring and rear cog tooth counts, along with total outer tire diameter in inches (standard road 700c is approx 27 in).

Example Calculation

A 48T chainring paired with a 16T cog on 27-inch wheels yields a 3.00 gear ratio, corresponding to 81.0 gear inches.

Formula

Gear Ratio = Chainring / Cog
Gear Inches = Gear Ratio * Tire Diameter
Skid Patches = Cog / GCD(Chainring, Cog) [if fixed gear]

Frequently Asked Questions

Common questions and answers about the Bike Gear Ratio Calculator.

The Bike Gear Ratio Calculator is a free online tool designed to analyze gear ratios, gear inches, skid patches, and development meters for bicycle drivetrains. It allows you to perform these calculations quickly and accurately without manual computations.
Enter front chainring and rear cog tooth counts, along with total outer tire diameter in inches (standard road 700c is approx 27 in). Once you enter these values, the calculator will automatically compute and display the results instantly.
The Bike Gear Ratio Calculator uses the following formula to calculate your results: Gear Ratio = Chainring / Cog Gear Inches = Gear Ratio * Tire Diameter Skid Patches = Cog / GCD(Chainring, Cog) [if fixed gear] This formula is standard and widely accepted for these types of calculations.
Sure! Here is a practical example: A 48T chainring paired with a 16T cog on 27-inch wheels yields a 3.00 gear ratio, corresponding to 81.0 gear inches. This example demonstrates how the inputs are processed through the formula to yield the final results.
To use the Bike Gear Ratio Calculator, you need to enter: Chainring Teeth, Rear Cog Teeth, Tire Diameter (inches). These inputs help the tool calculate precise results tailored to your situation.
The Bike Gear Ratio Calculator outputs the following details: Gear Ratio, Gear Inches, Skid Patches (Fixed Gear). This comprehensive breakdown helps you understand the different aspects of the calculated figures.
Yes, the Bike Gear Ratio Calculator is 100% free with no registration or signup required. It is fully responsive and optimized for mobile phones, tablets, and desktop computers.
Reliable Calculator provides a fast, clean, ad-free, and premium user experience. The Bike Gear Ratio Calculator uses verified math formulas and provides instant results with visual breakdowns and examples, making it more intuitive than other tools.