Originally Posted by
zen_
Some of the test on that site are a few years old, and it was only a few years ago that 35c was considered normal for a gravel tire.
https://www.bicyclerollingresistance...gravel-reviews
All the tests show as 2020 or 2021.
Regardless of if they are new or old, 40mm +/- a couple mm isn't really some new revolutionary gravel tire size though.
GK SK in 40mm that measured to 43 for many have been around for over 5 years.
Clement XPLOR MSO in 40mm were introduced 10 years ago.
WTB Resolute in 42mm is 4 years old at least, and other larger cased WTB tires are older.
38-40 seems like a sweetspot for intentional builds(vs cobbled together ones) for years now. And 40-45mm have become more popular in the last 4 years.
So 38-43mm is very much a popular size range.
It seems that when comparing rolling resistance, weight, tread, etc- tires in a category will be similar. A 33mm isn't at all similar to a 42mm.
But its his site and his time. Without his site we would have even less into and have to rely on marketing speak even more.