It's important to note that WheelEnergy and BicycleRollingResistace (as well as all of the other Crr machines/methods I've ever seen) are designed to specifically isolate tire losses due to hysteresis, or what we refer to as 'casing losses' and are NOT designed to pick up on any of the impedance losses seen when riding on the road. This makes sense as when you are designing a tire, you are only worried about what you can control through tire design and manufacturing, and everything else is just complicating noise.
The impedance part of the equation comes from testing with actual high hysteresis/high damping masses (humans) sitting imperfectly on actual bicycles riding on various surfaces. The impedance losses are always there, but are continually rising as pressure increases.. at some point they overcome the casing losses of the tire, as the bulk of the Crr moves from losses due to casing to losses due to shaking the high hysteresis mass on top of the bicycle.
Personally I think we need to reframe this post and so many others.. without knowing the MEASURED tire width, rider weight, and road surface it is impossible to have an opinion here.. so if somebody says they ride 120psi, we need to know way more before we say that it too much or too little.
Lastly, we are ~90% done with our pressure algorithm based on fitting thousands of real world test data points and look forward to sharing once the calculator is ready for prime-time. I think for many, the amount of information required on the input side will be surprising, but that's a good thing.
Josh
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