Look at disc wheels for the rear and think about it. They're heavier, the aero and lack of turbulance -"spoil", provide benefits over weight. The flywhell effct does come into play,not solely based on weight.The lack of wind turbulance created by the wheels ALLOWS the momentum to continue,rather than create more resistance as speed increases like an old Schwinn excersize bike.The weight MAY help,I never thought about the flywheel comparison as such,interesting notion.