Bicycle gears calculator

More than ever people ask nowadays: "What gears to choose for my bicycle?".

Old school 3×9 or more and more popular 2×10 or perhaps the newest addition by SRAM XX1 1×11,
or any other options? What combination is best for hilly courses, technical courses or flat ones?

Compare all the gearing options you are considering and pick the best one.

Added list of wheel / tire combinations and made calculations more precise, if you find anything incorrect let me know please.

Calculates gear ratio of your setup and converts it to 26inch wheel setup (can be turned off in options) to be able to compare gear ratios among different wheel sizes.

Allows you to add custom cassettes and chainrings. The address of the webpage always reflects selected setups.

If you copy-paste the link from your browser address bar you can save, bookmark, send, share it and it will keep the gearing setups you selected.

Max ratio:: Ratio of the highest gear of your setup.
Min ratio:: Ratio of the lowest gear of your setup.
Table below:: Shows table of all possible chainring/sprocket combinations with gear ratio. Moving your mouse over the ratio will show speed you will achieve by pedaling at 100 rpm.
Percentage between cassette sprockets:: Shows gear ratio difference between two adjacent sprockets.
Speed table:: Shows speeds at different cadences in your highest and lowest gear.
Red ratios:: Overlapping or boundary gear combinations

If you have any suggestions, questions or error reports, feel free to email me at michael.simek@gmail.com.

Website is subproject of MTBCrossCountry.com, website containing XC results, pictures, calendar, riders' information.

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Settings are saved in your browser's cookies.

Speed unit Wheel size base Change only if you know why, "real gear ratio" will not allow you to compare different wheel size setups easily.
Base cadence Export to CSV file - saves all ratios to a text file

? Calculates gear ratio of your setup and converts it to 26inch wheel setup (can be turned off in options) to be able to compare gear ratios among different wheel sizes. Allows you to add custom cassettes and chainrings. The address of the webpage always reflects selected setups. If you copy-paste the link from your browser address bar you can save, bookmark, send, share it and it will keep the gearing setups you selected. Max ratio: Ratio of the highest gear of your setup. Min ratio: Ratio of the lowest gear of your setup. Table below: Shows table of all possible chainring/sprocket combinations with gear ratio. Moving your mouse over the ratio will show speed you will achieve by pedaling at 100 rpm. Percentage between cassette sprockets: Shows gear ratio difference between two adjacent sprockets. Speed table: Shows speeds at different cadences in your highest and lowest gear. Red ratios: Overlapping or boundary gear combinations If you have any suggestions, questions or error reports, feel free to email me at michael.simek@gmail.com. Website is subproject of MTBCrossCountry.com, website containing XC results, pictures, calendar, riders' information. ≡ Settings are saved in your browser's cookies. Speed unit Wheel size base Change only if you know why, "real gear ratio" will not allow you to compare different wheel size setups easily. Base cadence Export to CSV file - saves all ratios to a text file	1	+