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Road trip Which option is the best roll-on?

  1. Aug 6, 2009 #1
    When up to speed on cruise-control (70 mph), which set of wheels is the more efficient use of momentum?

    Set #1 (17" x 7.5" @ 16lbs) has its weight evenly balanced from pivot to outer rim.

    Set #2 (17" x 7.5" @ 16lbs) has most of its weight focused on the outer rim.

  2. jcsd
  3. Aug 6, 2009 #2


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    Staff: Mentor

    When moving at constant speed, the inertia of the wheels doesn't matter at all. When accelerating and decelerating, the one with the lower inertia (set 1) will give better performance.
  4. Aug 7, 2009 #3
    Wouldn't set 2 store more energy/torque in the centrifugal/centripetal relation? It would seem as though moving most of the weight to the outer rim would increase the lever arm from the pivot.

    (forgive me if I'm using the wrong terminology)
    Last edited: Aug 7, 2009
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