Look on the incomparable Sheldon Browns site for guidance, look under the heading "width considerations" about 3/4 down the page. http://www.sheldonbrown.com/tire-sizing.html
Doesn’t help predict tyre width wrt rim width. It helps explain what rim widths will work safely with different tyre sizes.
@dancing james started
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Look on the incomparable Sheldon Browns site for guidance, look under the heading "width considerations" about 3/4 down the page.
http://www.sheldonbrown.com/tire-sizing.html