Originally Posted by
bikeman715
the rule of 20 psi less the max is for winter riding in snow so there more rubber (tire) touching the ground. if you go with max then it slid more. to keep snakebite from happening the psi should always be at 50% or more of the max psi to keep the tire from slipping.
I understood what you were saying but you did not put carrying weight into the equation. If a person is 250 pounds riding a bike with 20psi less then max, when they should be running at 10% more then max thus 20 psi less would be about 10 pounds less then max is a recipe for tire problems. Also if the person is only 140 pounds normally they should be running 20 psi less then max on dry snow free roads, so now your suggesting to drop the psi 20 psi from max which means the tire will slip. Your forgetting the weight.