Join Date: Sep 2007
Bikes: '86 Trek 770 Pro Series, 80's Torelli Corsa Strada
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I can't give you any numbers, but I'd say it will fluctuate depending on how much load you're putting on them. Course, terrain might call for some adjustments as well. I don't think tire pressure is an exact science. Try different ones for different situations, and I'm sure you'll get a feel for what you and your tires like.
Sheldon has a starter on tire pressure here