Originally Posted by
timdow
I was researching tires and their rolling resistance, and was surprised to find that to achieve the optimum rolling resistance, tire pressures are a lot lower than I had been using. For example, my 35mm 700c with 230 lb bike/rider/gear optimum pressure is: 53R/52F. For a MTB of the same weight, and 2.3" ideal tire pressure (as far as rolling resistance and speed goes) would be 26.5R/25F.
This was calculated at:
https://silca.cc/pages/sppc-form
I have gone to the lower pressure in my commuter bike with the 35mm ties, and it not only seems as fast or faster, but is also more comfortable.
That is true. That's why so many people are running tubeless tires. When you run lower pressure with tubes you run the risk of pinch flats. I still run tubes so I run my pressure a little higher. But the lower pressure you can get away with the better.