Quote:
Originally Posted by Bmnorm2
Rotational Inertia of a tire = m*r^2
Falken: I = (28.123kg * 0.4165m^2) = 4.88 kgm^2
Firestone : I = (24.358kg * 0.4305m^2) = 4.51 kgm^2
So, the Firestone will actually take less energy to turn. The Firestone results in ~ 7.5% inertia reduction. Due to the squared radius, often the larger tire will have a higher moment of inertia however in this case the mass is reduced enough for the taller tire to be a lower moment of inertia.
If both tires have the same rolling resistance, you may be slightly better fuel economy with the firestone. I have no idea what their rolling resistances are.
In general, I wouldn’t expect to see any notable difference.
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The tread pattern definitely effects rolling resistance. As does casing construction, and rubber compound.
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