I normally keep the tires at 20 in front, 30 in rear, 2 pounds over the recommended level. That pressure just seems to work well for me. But while I don't mind checking and adding air if needed in the front tires, the rear tire is a real PITA for me. With my bad shoulders and prosthetic knees, laying flat on the ground to get to the tire valve stem on the rear tire and not easy for me. So when I see the pressure down a bit I may or may not go through adding add pressure for just a few pounds. For me, if the front tires get to 15 or lower I won't ride until I add air. For the rear tire, no lower than 24. Anyone think that these numbers are too low and that I am taking undue risks? I have been riding for decades but do not claim any expertise about tires and air pressures.