What should be and what is are two very different things. That's based on data directly from the CDC for the "average American adult male."
And in all honesty, the typical guy I see out on a bike trends much more toward the CDC average than he does toward the build of a professional cyclist.
It's hair-splitting to focus on the height/weight anyway. To maintain 20mph on flat ground, the difference in wattage required for a 5'9" 198lb rider and a 5'9" 148lb rider is about 10%, 193 vs. 172.
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