Jaguarundi

The above quote from the calculator is why I started this thread. Because where on Earth do you find the safe minimum for the tire? But aside from that, I agree with most of you that tire pressure shouldn't go that low. I think that calculator becomes impractical at either end of its range (it recommended 145 for someone??). Perhaps tire pressure change relative to weight should not be a linear relationship. I'm going to keep inflating to at least 60-90, though even that seems on the low side.

And wrr1020, lol, hand pumps suck! I think I may be having the same problem as you.

chinarider

I really don't understand how a tire can have a minimum pressure. Max I can understand. But so long as the pressure is sufficient to prevent pinch flats (and achieve the mythical 15% deflection) whether that be 50, 90 or 110 psi, how can running at that pressure damage the tire? I note some tires have min & max, some just have max. Do the ones with the minimum want us to pump higher than really necessary to guard against pinch flats?

RT

This is the answer you seek.

Psimet2001 

We use tubulars in cyclocross because we can run extremely low pressures and reduce the risk of pinch flat or rolling the clincher off of the rim.

If your pressure is low enough that you get pinch flats on the road then "you're doing it wrong." Period.