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Bicycle Gear Calculator 98.12.005 - User Guide and FAQ

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Calculations

All calculations are done in the Bicycle Gear Calculator application.

US Standard (chainring teeth/cog teeth) x (wheel diameter)

Metric Standard (chainring teeth/cog teeth) x (wheel circumference)

Estimated Speed (chainring teeth/cog teeth) x (wheel circumference) x rpm's

Measurements

How many teeth
The amount of teeth for the cogs and chainrings should be stamped on their sides, if for some reason they can't be found, then you will have to resort to counting the teeth.

How to measure you wheels
This will be your hardest job, but if you have already installed a cycling computer on your bike then you probably already have measured your wheel circumference, and that is all you need.

If you have never measured the wheel circumference before

Make a mark on the fully inflated tire of the wheel being measured with a piece of chalk or crayon.
Find a floor with about 3 meters or 10 feet of room to mark a straight line, or use an existing line. (Floor tiles work great.)
Using a plum line make a starting mark on the straight line on the floor were the mark on the tire is directly under the axle of your wheel.
Roll the wheel straight along the line until the mark on the tire is directly beneath the axle again and make an ending mark the floor.
Measure the length of the straight line between the two marks on floor, this is the wheels circumference.

Charts

Three distinct charts are generated to provide the largest amount of information. The accuracy of the charts is directly related to the number of decimal places selected in the calculations.

To copy the any of the charts use the right mouse button to bring up the popup menu. Only the Text table will copy the text of the table, all the other charts will be graphics.

Gear Table

This chart displays the standard gear table used to identify the gear ratio's. It is best used as guide for picking the best gear at a specific speed or for setting up a cog and chainring combination that is the most favorable for a particular rider.

Gear Ratio Line Graph

This is the Gear Ratio Line Graph used for analyzing cog and chainring combinations. The straighter the lines - the better the rear shifting performance will be.

Gear Ratio Log10 Graph

This is the Gear Ratio Log10 Graph used for analyzing shifting navigation. The cogs for each chainring should be evenly spaced and a minimum of gear ratio duplication is preferable.

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