Originally Posted by
Wogster
As for rim widths, you need to refer to St Sheldon the patron saint of bicycle mechanics. Have a look at
this page on tire sizing, go to the bottom of the page, then go up to a red and green chart, this will tell you that for a 32mm tire you need a rim between 15 and 19mm wide.
Note that Sheldon's chart shows inner width, where most rim sizes are shown as outer width. Subtract about 5mm to get the size applicable to his chart. A typical Open Pro rim is 19mm outer and 14mm inner width. So instead of being at the upper end of the recommended range for a 32mm tire, it is slightly under. OTOH, people run 32mm tires on Open Pros all the time with good results. YMMV.