Tire Pressure Calculators
Rhône-Alpes France & Piedmont Italy
makes this page possible
“15% drop” method
Weight measured at wheel
Weight of (Fully-dressed) Rider & Bike
If calculated pressure exceeds tire’s rated maximum, choose a wider tire. If calculated pressure is below tire’s safe minimum, choose a narrower tire.
From Optimizing Your Tire Pressure for Your Weight by Jan Heine (or a more extensive version, “PSI RX” by Jan Heine, Adventure Cyclist magazine, March 2009).
This archive argues that the whole 15% drop premise is flawed.
Michelin Bicycle Tire