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It's likely the tyre compound, a Schwalbe Marathon or Plus is ALWAYS bigger than any other makes. The 35 is 37 and the 38 is 40.
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For the ETRTO designation, the stated width should the 'nominal section width' i.e.'the section width from sidewall to sidewall of an inflated tyre on its theoretical rim'. It may be that the other size being stated is the 'overall width' which is basically the tread width.
In ETRTO, they only describe this for tyres where the tread is wider than the sidewall. This is what I have found WTB do for example with the Venture tyre. The ETRTO measurement is 37-622 for the casing, but the tread is 700x40.
coventry_eagle
chiroshi
@M_V
Why do so many tyres have a discrepancy in the width between the '700c' listing and the ETRTO listing?
EG, this Schwalbe Land Cruiser is listed as 700 x 35 but 622 x 37
Similarly, this CST tyre is listed as 700 x 40 but 42 - 622.
If you google 'ETRTO tyre sizes' or anything like that all the explanations suggest that the width should not change, ie, a 700 x 35 tyre should be a 622 x 35 or a 26 x 2" should be a 559 x 50 and actually, for the 26" tyres it does seem to ring true, every tyre that SJS have listed as 26" x 2" is also shown as 559 x 50 so why the difference with 700c/622 tyres?