Quote:
Originally Posted by Vman455
You mean angular momentum? Rotational inertia is independent of speed.
All that as a prelude to saying, I don't get that result using representative tire dimensions and weights from Tire Rackfor the 185/55R14 and 185/75R14 I compared just now (they don't list any 165/xxR14), the larger tire still has higher angular momentum....

Maybe I'm confused by the terms, but the math works out that the energy stored in a spinning tire is very slightly less in the tire with a larger diameter, all else being equal, if you want to be traveling at the same speed. It's counterintuitive but the reduction in RPM is worth more (slightly) than bringing the mass closer to center and spinning it faster.
Angular momentum is likely the term I wanted.