Originally Posted by
GhostRider62
I wonder how others determine the appropriate tire pressure for their conditions if the don't use Silca or other online calculators?
I won't use hookless on 25 mm tires because 85F/89R is the pressure needed for my conditions and that exceeds the rim makers spec
On 303 Firecrests with 25mm internal hookless rims, I run 32mm GP5000 tubeless at 55F/60R generally or 50F/55R on chippy roads.
Testing Crr is not so easy, it can be done. Do you just pump them up til they are hard as a rock or what criteria is used?
I plan to use the wheel manufacturer calculator as my starting point then playing with pressures in small steps from there. I suppose that if you had a power meter and a set course you could more exactly find that perfect pressure. I am a bit on the heavy side coming off winter so I plan to run a 28c front tire and a 30c rear at around 65psi and see how it goes. Zipp at least does not approve any 25mm tire on their 23mm internal width rim.
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