Quote:
Originally Posted by Ecky
You might be surprised to learn, but I did some math yesterday and it turns out the inertia of a wheel actually goes down as the aspect ratio (and thus overall diameter) goes up, because it spins more slowly. So, in effect, a 165/80r14 tire is "lighter", inertially speaking, than a 165/40r14.

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....