What is the difference between gear ratio and gear inches?

Gear ratio is calculated by dividing the number of teeth on the front chainring by the number of teeth on the rear sprocket, representing the mechanical advantage. Gear inches are calculated by multiplying the gear ratio by the wheel diameter in inches, providing a relative measure of bicycle gearing that corresponds to the diameter of an old-fashioned penny-farthing bicycle with equivalent gearing.

Can this calculator be used for bikes with internal hub gears?

The calculator notes that gear ratio is not a good measure when planetary gears are involved, so it may not provide accurate results for bicycles equipped with hub gears that have internal planetary gears.

Do I need to know my exact wheel size to use this tool?

You can input your specific wheel diameter in inches for the most realistic gear inches calculations, or you can select from common wheel sizes if you do not have the exact measurement.

What can I learn from the gear ratio tables produced by this calculator?

The gear ratio tables show all possible combinations of front chainring and rear sprocket teeth, allowing you to see the full range of mechanical advantages available on your bike and helping you choose combinations that best suit your cycling preferences and riding conditions.

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Bike Gear Calculator

Provided byOmni Calculatoromnicalculator.com

The bike gear calculator shows the tables of gear ratios and gear inches for chosen chainring and cog ranges.

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About this tool

What Bike Gear Calculator does

The Bike Gear Calculator on Omni Calculator helps cyclists explore the mechanical advantage of different chainring and sprocket combinations. By entering the number of teeth on the front chainring and rear cassette cogs, the tool generates tables of gear ratios and gear inches. It also incorporates wheel and tire parameters to make the results realistic for a specific bike setup. The output allows users to compare how many teeth in the front relate to those in the back, producing a clear picture of the bike's gearing range for various riding conditions.

Step by step

How to use the Omni Calculator Bike Gear Calculator

1
Enter the minimum and maximum number of teeth on your front chainring
2
Enter the minimum and maximum number of teeth on your rear cassette cogs
3
Input your wheel diameter (or select a common size) to calculate gear inches
4
Review the generated tables showing gear ratios and gear inches for all possible combinations

Is it right for you

Best for

This option suits cyclists, bicycle mechanics, and hobbyists who are optimizing equipment choices or planning for specific riding conditions, as it provides a detailed understanding of the mechanical advantage across different gear combinat

Limitations

Results are estimates based on user-provided inputs
Does not account for drivetrain efficiency losses or rider fitness factors
Gear ratio calculations may not be accurate for bicycles with internal hub gears involving planetary gears

Questions

Bike Gear Calculator FAQ

What is the difference between gear ratio and gear inches?: Gear ratio is calculated by dividing the number of teeth on the front chainring by the number of teeth on the rear sprocket, representing the mechanical advantage. Gear inches are calculated by multiplying the gear ratio by the wheel diameter in inches, providing a relative measure of bicycle gearing that corresponds to the diameter of an old-fashioned penny-farthing bicycle with equivalent gearing.
Can this calculator be used for bikes with internal hub gears?: The calculator notes that gear ratio is not a good measure when planetary gears are involved, so it may not provide accurate results for bicycles equipped with hub gears that have internal planetary gears.
Do I need to know my exact wheel size to use this tool?: You can input your specific wheel diameter in inches for the most realistic gear inches calculations, or you can select from common wheel sizes if you do not have the exact measurement.
What can I learn from the gear ratio tables produced by this calculator?: The gear ratio tables show all possible combinations of front chainring and rear sprocket teeth, allowing you to see the full range of mechanical advantages available on your bike and helping you choose combinations that best suit your cycling preferences and riding conditions.

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