okay then go do a test yourself. get a set of light wheels and a set of heavy wheels, then sprint up to lets say 35 mph from about below 10 mph. measure how long it takes for each wheel. when you notice no difference, remember that all the marketing behind bike parts are overstated beyond belief.

if a rider is getting dropped on any ride, lightening his bike by even 10 lbs wouldn't help him enough, especially if he wasn't dropped on a pure climbing race.