Originally Posted by
LarrySellerz
Don't get hung up on the numbers, divide by 3 would be better, but my point is that very wet conditions require enormously lower PSI, to the point in which trying to rely on an equation for all conditions is impossible. Using a calculator allows for more user error; any talk of calculators for OP is missing the forrest for the trees because he mentioned he rides in terrible conditions in his first post.
I don't require enormously lower pressure when riding in very wet conditions. I might drop 5 psi if I know it's going to be very wet before I start, but I've ridden some hard rides with very technical descents in rain storms without an issue at normal pressure. But then my normal pressures are not as high as yours. Dividing my pressure by 3 is just complete garbage IMO. But thanks for the tip.