Current Projects chat and miscellany

As a slightly serious question, although these factors are obviously interesting to an engineer, and to a bike manufacturer wanting to demonstrate having the best possible science, how much difference does it really make to the cyclist? I know aerodynamics is a major factor in cycling, but how much of what we're talking about is perceivable or measureable outside of the lab?

i'm not certain in terms of frame aerodynamics but i can definitely feel the difference in speed when using a deep section wheels on my race bike rather than shallow rims, other than that i haven't felt too much of a change without the use of forward facing rest bars