Originally Posted by
Drew Eckhardt
It's more than you need in your front tire.
https://www.quora.com/How-much-air-s.../Drew-Eckhardt
At 155 pounds with an all-up weight around 180 and 45/55% weight balance you might have 80 pounds on the front wheel which suggests 60 psi according to the 15% drop rule of thumb and 100 on the rear calling for 75 psi.
I'd leave the rear alone and see how the front feels with 10 psi less.
At your weight I start my week on 25mm GP4000SII tires at 85/95 psi and finish at 75/85 without pinch flat problems.
I think this is very reasonable.
That said, is there really any science behind the 15% drop rule?? I suspect not. Why not 12%? Or 18%?? A different percent drop will of course give you a different pressure.