I would think that
rotational weight = the rotational acceleration * the mass of the rotating object
dead weight = dead weight mass * acceleration due to gravity
At a stable velocity with no outside forces acting on your system (biker+bike), theoretically, you need no force to move the bike! Of course, you have friction working against you, so you'd have to factor some friction as a coefficient into those two formulas.
Someone check my physics?
Hope that makes a little sense ...
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