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I have also wondered this. The answer is probably here: http://www.etrto.org/Publications/Order/STANDARDS-MANUAL
I have also wondered this. The answer is probably here: http://www.etrto.org/Publications/Order/STANDARDS-MANUAL
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chez_jay
@zigbit
Why do some tyres have differing advertised sizes and ETRTO numbers, when it comes to width? Noticed that my 38c GravelKings have the ETRTO numbers moulded as 40-622 on the sidewall, right next to the printed 38c.
I've since noticed this on a couple of other tyres, with differences of 1-3mm.