Originally Posted by
Lazyass
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.
I used to work for a German tire manufacturer you may have heard of. They performed Crr tests and I got to see all the data. Once, I even got to play with their new machine.
Weight transfer varies. I don't have data handy but know it happens since, and I hope we can agree here, we shift our body weight while riding to deal with the conditions mentioned. It also shifts during braking. Since weight distribution varies so much during riding it is an unreliable metric on which to base pressures.
Heat from riding a bicycle will not increase tire pressure to any demonstrable degree (although heat transfer from prolonged braking can). Again, are we supposed to adjust pressure of after a long descent and then pump up again for the next climb? I think we can agree that would be impractical. Perhaps finding a median pressure that handles both conditions optimally and striking a balance between them would be prudent?
Maybe we could do the same thing for grip, durability, puncture resistance and rolling resistance?
Oh wait, I think tire manufacturers do exactly that and then write those numbers on the sidewall of the tire as a range where the cross section of ALL aspects of performance intersect to the greatest degree. You can then adjust to taste.