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https://www.lfgss.com/comments/12270960/
I was wondering this 8 years ago and still don't know the answer.
Edit: on the sidewall of Schwalbe tyres it actually says both numbers, so 40 and 42 (on the same tyre) for example
kjlem
I know that manufacturer's stated widths are not always true to real life but I just want to know why the size stated differs between the regular (700c x ... ) and the etro (622 x ...) sizes.