Originally Posted by gravelslider

Try your 32 mm tires on an 23 - 25 mm internal width rim and you will find that an even sweeter combination than on your narrow rim. Ignore teh chart and follow the tire manufacturer recommendations for rim width. I find ideal gravel rins have an internal width of 223 - 25 mm. Much wider and you cannot reasonably run a 30 mm tire and much narrower and you kose out on a lot of stable riding experience.