Originally Posted by Sardines

I should add that Schwalbe and other manufacturers fudge the sizing a bit. They list ETRTO and ISO sizing and it's usually between the 2! The Marathon Supremes and Almotion are examples. The Supreme lists as 622-37c in ETRTO but 700-35c in ISO, and 28x1.4 just to mess with us! haha. Same for the 622-42c ETRTO, 700-40c ISO. You'd think in this day and age, the manufacturers would just get together and standardize everything.