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Something else to consider - while a larger tire may have lower RR at a given pressure, the pressure ratings for tires of different sizes are different.
I have a set of Schwalbe Big Ben tires on my velomobile and I remember reading they were supposed to have lower RR at a given pressure, but they're also rated to be used at dramatically lower pressures. I pumped them up and still have greater suspension effect, I'm unsure about the RR difference, but I also notice the handling is affected - they're a lot heavier.
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