Originally Posted by
Bob Dopolina
This Berto chart again? This thing gets trotted out every time tire pressue threads come up.
It is wrong.
Wrong.
It is focused solely on comfort. Yes, lower pressure is more comfortable. BUT, and this is where the first error is, it also means decreased flat protect, increased tire wear and increased rolling resistance.
It is based on a 60/40 weight distribution which is fine is you only ride sitting down and never stand up, climb, corner or desend. If you do any of those things then those numbers go out the window. That is mistaken assumption number two for those keeping track.
So, if your only aim is comfort, and you are willing to sacrifice all other aspect of your tires performance and you only ride on flat roads sitting down then, by all means, follow Berto's recommended pressures and ignore what the people WHO ACTUALLY MAKE THE TIRES have to say about it.
It's not wrong just because you say so. You don't even give specifics. The chart was based on rolling resistance tests. Have you personally performed rolling resistance tests? Perhaps you could show us what pressures each tire manufacturer recommends for specific rider weights? So for those of us who do stand up, climb, corner and descend maybe you could tell us what the correct weight distribution is? Do you know how much tire pressure can increase with heat? ? If you don't agree with the chart, fine. But at least bring some facts of your own.