Originally Posted by
Jim Kukula
One thing to watch out for in puzzling through these issues: there are two ways to measure the width of a rim. The outer width and the inner width. Usually the inner width is 5 or 6 mm smaller than the outer width. E.g. look at the diagram on the ZAC 19:
Products | Ryde
as he said there is inner width and outer... the inner is what really matters... on my 29er MTB I had a 22.8mm wide rim (18.3mm inner) and ran it with 2.25" wide tires with no issue... I've also run 28mm wide rims (23mm internal) with a 32c tire, the rim is tubeless ready with a great bead lock which made pulling a 32c tire off difficult (also a pain to seat the bead)... but I think the compatible/acceptable tire to rim width ideas are a bit on the conservative side.