Consider that from a programming perspective, imagine using no tech newer than 2004.

The transition to 28s took a long time itself

> Per 10mm tire width increase, you are getting 10 watts more aero drag at 25 mph.

Interseting, where can I read more about this? I don't think this conclusion lines up with either the article, or the research from rene herse. Travel surfaced also matters quite a it, I could see that maybe being true in an idealized setting.

There is more to it. Tire needs to be in contact with ground to transfer power. A skinny high PSI tire will spend a lot of time bouncing. Just one example of how other real world factors can be more significant.

Aero drag is just not that simple. You can’t, without testing, make the claim you’re making. Also, you can’t make the claim outside of the exact setup you tested. A different rider, wheels or bike could test faster on 40mm because aerodynamic drag is that difficult to predict.

32 also happens to be the biggest tire that fits in his Canyon race bike.