Originally Posted by
SoSmellyAir
A wheel having an inner width of 25 mm is fairly wide and a tire mounted thereon may have an actual width that > its nominal width.
Thanks. After I posted here I found a couple articles talking about rim width and its effect on tire width. It seems I should probably go for a 35 mm tire as the tire will be 1-2 mm wider on the 24 mm rim than on an 18 mm rim.