Originally Posted by ThermionicScott

That's definitely one of the most input-hungry tire pressure calculators I've seen! But it gives me suggestions in the 60's as well. There just isn't a need to pump tires up to really high pressures unless that's necessary to support your weight (or if that's simply how you want the tires to feel.)

BTW, 700C would be the closest option to 27", for the wheel diameter setting.