Thanks for the help. I understand that accelerating the rider is much more work than accelerating the added wheel weight, how does the decrease in rim weight translate to watts and/or time savings. Lets say I can hold 250 watts over 40km. Using this website (bikecalculator.com) a 300 gram reduction in bike weight saves me only 3 seconds. How much additional time would that save me if I were to reduce that weight from the rim instead of the frame.
In theory, this would also apply to shoes and pedals at the end of the crank arms. I am very interested in learning the math/physics behind this to see exactly how much it could save. Aerodynamics and drag are a big factor, but keeping that constant, I would like to learn how weight alone affects the outcome.