Originally Posted by
Ziemas
Most tire makers label their tires wide, for example Conti 4 Season 28mm are really 26mm on an Open Pro rim. In my experience Schwable tends to give accurate widths for their tires. My 25mm Marathon Pluses are very similar in size to my 28mm Contis.
+1 I commute on either 25 or 28mm marathon plusses - they tend to be about the size that they claim, which is bigger than most other 25s or 28s. Separate from that is the fact that they are a PITA to mount. They are very hard to get on the rim. Good news is that once on there, you won't have to take them off until they are worn out. I have a SMP 700C28 on the back of a utility bike which has over 6000 flat free miles on it - this is a rear tire on a bike that is almost always loaded with panniers and is ridden in all sorts of bad weather over bad roads.