Senior Member
Join Date: Nov 2005
Location: NW Ohio
Posts: 3,410
Bikes: 1984 Miyata 310, 1986 Schwinn Sierra, 2011 Jamis Quest, 1980 Peugeot TH8 Tandem, 1992 Performance Parabola, 1987 Ross Mt. Hood, 1988 Schwinn LeTour, 1988 Trek 400T, 1981 Fuji S12-S LTD, 197? FW Evans
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This is my non-scientific method. I have a gravel driveway, so once I am out on the road, the dust wears off the tread and I can quickly see if I have the right pressure. It there is just a narrow band of clean tread, I can lower pressure by a few pounds. If the tread is wiped clean from edge to edge, then I need more air. I aim to have about 1/2-2/3 of the tread width in contact with the pavement. Generally, the rear needs about 10 psi more than the front.