Originally Posted by timberline12k

I changed my tire order to Marathon Dureme 700 X 40C tires.

http://www.schwalbetires.com/marathon_dureme

http://www.schwalbetires.com/marathon_dureme_home

They are half the weight of the Marathon Plus 700 X 45 tires and provide better grip. It should suit my riding situation better. The are 1/4" more narrow, but the same width as the standard tire provided on the Salsa Vaya.

Marathon Dureme 700 X 40C tires have a manufacturer's suggested range of 50-80 PSI. Using the ratio provided in the above posting would suggest 50-60 PSI in the front tire and 70-80 PSI in the rear. I will probably start out at 55 front and 75 rear. I am assuming that is close to the optimum pressure for a 250 lb. load.