Mechanics and Fixing Any Questions Answered

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chiroshi in reply to @M_V

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.

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M_V in reply to @chiroshi

That makes sense for a knobbly tyre, not so much for a slick.

Even that WTB Venture it doesn’t look like the tread is really any wider than the casing.

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chiroshi in reply to @M_V

Even that WTB Venture it doesn’t look like the tread is really any wider than the casing.

It is on mine.

I could see it working for a skinny tyre if the tread is narrower than the sidewall section width. But in any case, it's a confusing way to designate a tyre size.

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