Originally Posted by

**San Rensho**
To calculate gear inches, you divide the number of teeth on the chainring, by the number of teeth on the cog and multiply by 27 inches. Most people think, "Oh, I'm going from a 25 tooth cog all the way to a 29 tooth cog, so there must be a huge difference in gearing." Well, if you do the math, its about 6 gear inches difference which is not that much. Its less of a jump in gearing (do the math) than from a 52/13 to a 52/14.

If you can feel 2 gear inches, you are a better man than I.