What you say is true, but also consider: What we are talking about is
acceleration (F=MA).  Without input of energy, the rolling tire is going
to decelerate due to friction.  The energy required to maintain a given
speed  is an acceleration and therefore is greater for a greater mass.
IMHO.

John Jensen, Mudbug Pottery
mudbug@toadhouse.com , http://www.toadhouse.com

>A heavier wheel takes more energy to GET going... once
>it is going, it takes the same energy to keep moving.
>First order approximation, of course.

A