Originally Posted by
dsbrantjr
Tire Sizing Systems scroll down 90% of the way. The chart is merely a guide, I've run 47mm tires on 19mm inside width rims without a problem for many years.
Honestly, I'd expand the selection by 3, 4 or 5 squares to the right (and maybe one or two to the left) on each and every rim width. It would still be quite conservative. I regularly run 54mm tires on 17mm rims without issue. I'm using 35 to 37mm tires on my 14mm wide Velocity Deep V's for touring without issue as well.