Originally Posted by
Russ Roth
Right, and you've made no effort to show where that trough is on a 23 or 20c tire, nor that being on the high side of that trough is worse than being on the low side for those sizes, you've just made grandiose statements with no proof, now do you get it? For the tire sizes that were being discussed YOUR CHART IS MEANINGLESS AND HAS NO BASIS FOR COMPARISON BECAUSE TIRE SIZES MATTER TOO MUCH, which is why I can run my 2.25 mtb tire over roots at 30psi but can't make it down the block on my 23c tire at the same pressure. You're argument would be valid for a 25c tire based on that chart, but you jumped in on 20 and 23c tires and those numbers are going to change considerably. From memory, 90psi on an 20c was asking for a pinch flat, which is why people stopped using them, but even 70psi on a 23 is getting close to the point you will dent a rim on a crack in the pavement. Get it?
Grandiose?
So you are just upset that there isn't a chart for every tire size and loading?
I don't see that as necessary since we already have tire charts that show ideal preload pressure. So unless the example with the 25c tires is wildly different than the recommended pressure charts, you can pretty much presume that ideal pressure recommendation is at or just below the break point, since the impedance is caused by not have the necessary 15% droop.