Tire Pressure Calculator [BikeTinker]

Tire Pressure Calculator

From Dave Adams, trimmed down to a Google Doc by me. Based on research by Frank Berto, as published in Bicycle Quarterly.

Bicycle Tire Pressure Calculator doc

Use the Google Doc to calculate the optimal tire pressure for your width, weight and bike geometry. Feel free to fudge the numbers up or down depending on tire casing stiffness, balance of speed vs comfort, or your own comfort level with the numbers. More info about the pressure calculator.
You can also use the original Excel file, or an ODT file in French (for hard-core francophile randonneurs, or actual francophones):