Join Date: Dec 2010
Location: Ann Arbor, MI
Bikes: 2010 Niner EMD, 2008 Surly Steamroller, 2007 Giant OCR.
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The width of the tires makes a huge difference, a 2.5" 29er can handle 30 lbs of pressure a lot better than a 2.1. Also rider weight and riding style can affect pinch flats as well. I'm 145 lbs and run at least 35 PSI in Kenda Smallblocks, 29 x 2.1 and have not had a pinch flat yet.
If you are looking to run a very low PSI, heavily consider getting wider tires with a tubeless set up. Wide tires are better suited to low PSI, as are tubeless tires or tires set up with Stan's.