Yes, the spreadsheet is based on Berto's measurements. I believe there's a 
downloadable spreadsheet in the Docs for this group, and there's a Google Doc 
version here. Bit.ly/biketirepressure.
If you have an Android phone, there's an app for it. Free demo here: 
bit.ly/tiredemo
As for super low pressures for very light people being accurate... I don't 
know. If you try it, let me know what you find. I do know that people run Fat 
tires at single digit pressures. I'd like to make more measurements with fatter 
tires and heavier and lighter loads. Maybe this summer we could have a 
crowd-sourced internet tire drop measuring party... Lots of 40+ mm tires on 
this list, and lots of careful people. 

Philip
www.biketinker.com

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