Not complaining, mind you, but still struggling to account for (a) how fast my SL and I roll vis-a-vis other rider+bike combos of
similar gross weight, and (b) how easy it is to pedal in OFF — even on modest hills.
I know that (a) contributes directly to (b) but can't help feeling that there's more to it. What, I can't say, but it's also unlikely to be aerodynamic.
View attachment 187930
The bare SL may be slightly aero, and I've tried to keep mine that way. But the riding position is still pretty upright, and no one would describe me as aero.
View attachment 187929
After offsetting differences in drag area (CdA), gross mass (M), and coefficient of rolling resistance (Cr) from the scenario above, the SL and I probably still have a roughly 9 mph
crossover speed (Vc) — at which air resistance reaches 50% of total on smooth flat pavement in still air. In the figure caption above, TR = total resistance and RR = rolling resistance.
is around 10-12 mph on flat, smooth pavement in still air, as drag area (CdA) is probably closer to 0.50 than the 0.63 used above, and the coefficient of rolling resistance (Cr) with 38 mm Pathfinder Pro tubeless tires at 35 psi is probably closer to 0.005.
At the higher ground speeds generally involved in the observations in question, rolling resistance quickly becomes a small fraction of total, and I just can't see a big aerodynamic advantage in my favor.
What manner of sorcery be this?