So first time hearing about the Silca calculator so I plugged my weight & tires in: at 260 loaded weight the 42mm 700c tires I can run 41/44 F/R and slightly less for rougher roads or slightly higher for smoother roads. For 55mm tires I can do 25/27. That…… is honestly close to what I was noticing when I would hop on my bikes w/o checking pressure. Obviously the 42mm UD tires were way more sensitive to pressure changes, but I was riding the 55mm RH and not immediately realizing how low the pressures were. I guess when you’re so used to running high pressures due to weight and running tubes it feels different when you can finally dial down to lower pressures, but I digress.