Originally Posted by
Darth Lefty
So here's a fresh data point - I just went out to my trike and measured the right front 40-406 Marathon GG. It's 1.54 in wide on my dial caliper, which is 38.5 mm. I've got no idea though what the rim width is, other than it's about right, nor what the pressure is today, since I haven't done that in 2 weeks at least.
There are specific inflationary pressures that are employed with ETRTO and specific rim widths to be employed (not suggested as per the OP).
In addition, the standard measures tyre width, which is exactly what the OP is after.
To me, the question of the OP is facetious, because when mounted on the correct rim width and inflated to the proper pressure,the tyre width is printed on the size of the tyre. I'm slightly befuddled as to why this isn't common knowledge.
Also, 1.54" is 39.11mm, which would probably go to 40mm at the middle of the inflationary range.
I would wager that if you're on the correct rim width and inflate to middle of the range listed on the side of the tyre, you'd be bang on the written width.
That's what I'd say as a reviewer and request that in the revisions of the manuscript.