This is a link to someone that went from 191W to hold 40K to 181W. I find this much more believable. ~4% over changing lots of things. Shoot 1% is worth a lot, but look at the things that changed and what the lab test said the effect was - at 0 yaw. If in any of these there was more discomfort, or handling was decreased, I expect real life application would be different. And then real wind and real pavement make things different.

I see few riders that do not turn their heads and negate a lot of the aero benefits of their helmets, which is why a less aero helmet like the KASK Bambino, or a POC may yield faster times than a more aero one.

In the wind tunnel with the Ventum One ? Cody Beals