Heavy rims keep higher average speeds and save energy
a) True   b) False

Heavy rims create a higher inertia.  Higher inertia makes a wheel slower to accelerate.  Slower acceleration lowers the average speed by the amount of extra energy required to bring the wheels up to the terminal speed that the rider's power allows given their aerodynamic and mechanical drag.  In race venues where there are more accelerations and decelerations (climbing courses or courses with many turns or braking) this difference in average speed will be more acute.

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