Example 1 2. Count the number of teeth on the chainrings and rear cogs of your bike and add the numbers to your chart. As in Example 1 above, write in chainring counts across the top and rear cog numbers down the left side. Write in the ratios on your chart as in Example 1 above, and click for more on how to evaluate your gears . For best results, reduce or print pages horizontally.
Gear ratios shown are approximate.
For other gears or greater accuracy, multiply drive wheel diameter in inches by number of chainring teeth, then divide by number of teeth on rear cogs for individual ratios. Site contents copyright 1998-99, David A. Wolfe. All rights reserved.