Ok. My Big apple is 60-622. I've mounted it to a Bontrager Rhythm rim that is 622x22. So that's a 22 mm wide rim versus yours that is 26 mm. (Edit: And I put in 25 psi). My tire width measured with my calipers is 57 mm. My outer tire diameter measured using a tape appears to be 29 3/8". I put the wheel against the door jamb in my office, nicked the jamb where the top of the tire came to, and measured using a tape from the floor to the nick.

Hope all that helps. Make sure to leave yourself some reasonable clearance. It's a crapshoot if you're pushing things to the last millimeter. Sometimes you just have to mount the tires onto the bike and see where things fall.