Thread: Which is wider 26 1x3/8 or 26 1.5?
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Old 10-24-17 | 03:20 PM
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JohnDThompson
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Originally Posted by Broctoon
Unfortunately, nominal tire "sizes" don't correlate directly to actual measurements, unless you're looking at ETRTO, the only universal and mathematically accurate spec system.
While the ETRTO bead seat diameter numbers are fully reliable, the ETRTO widths are affected by rim width. E.g., this ETRTO 40-590 tire measures 36mm wide when mounted on a Sun CR-18 rim:

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