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half-step gearing cog and chainring designer

Page created April 24, 2010 by Garrett Belmont, with infographics advice from James Black.

Technical issues: Page is not working properly in Firefox. If anyone knows why, please let me know - cycle@appleblock.com. The table background image does not align properly in all browsers, and therefore is turned off. This is also an unresolved issue.

Note: Best used for 5 or 6 speed cog sets. 7 and 8 speeds added for fun. Author is not responsible for bad chainline. Tips: To find a desired cog set (perhaps one you already own) make small adjustments to the percentage and gear inch. To find particular chainrings, adjust percentage, gear inch, and smallest cog.

Wheel diameter (inch). 27 works well for 700c (700x32), and 26 for 650b. Smallest cog (teeth) Ratio jump (percent). If 10 is desired, experiment by trying 9.5 or 10.5. Approximate highest gear inch

►     ◄   ►     ◄   ►     ◄   ►     ◄   ► 5 speed     ◄   ► 6 speed     ◄   ► 7 speed     ◄   ► 8 speed

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