Originally Posted by
ThermionicScott
I would argue that the calculator
is the city, and once in it, the user (whose brain is the product of millions of years of evolution) should be able to find the park. The articles upon which the calculator are based are very explicit that if you find yourself exceeding the max pressure ratings, you should consider using larger tires.
As for going under the mininum pressure rating, I'm not sure there is a front tire in my collection that is over the minimum rating, if there is one. I'm a happy rider just the same.
That's fine. But now to apply to the OP's situation. His floor pump may be telling him his 25mm tire is at 80 psi which is all well and good. But suppose the meisser would say it's 60 psi. Taking the simple advice to ride what is comfortable might mean he's riding around at a real 60 psi which is the theoretical ideal comfort/speed blend but which is potentially unsafe.
All in I'd say the best advice is to do whatever is necessary to identify which tire gauge is trustworthy, and not rely on feel.