Originally Posted by DrIsotope

If 7lbs of variance is good for 8% difference in speed/effort, then what's 1-2lbs gonna do? Even as a thought exercise, what's the point of this? A lighter bike on narrower tires will get you there 8% faster. How much are you willing to spend to "save" those 6-8 minutes a day?

My CX bike is steel, has absolutely zero done ot it in the name of weight savings, and is a hair over 20lbs with nothing on it (no electronics, no spares, no cages, no pedals) but that weight figure is meaningless.