Five days until my first tour. Aberdeen, WA to the Golden Gate Bridge. Should be fun. I'm sure that I will have questions to ask before I leave, this is the first. I am using Schwalby Marithon 26" x 1.5 tires. They say that the low is 45 & the high is 100 psi. I have been riding them at 85. My bike loaded should be about 75 pounds, and I weigh 220. What tore pressure do you think I shoudl run?