I believe 28, 700C and 29 are all the same. People just call them differently.Yes you do need to adjust your tire diameter in your display. Always necessary when fiddling with tire diameters. 29" is for big tires like a 4.5-4.8. 28" is what I am using right now with 4.0" tires on that orange bike. Arrived at via measuring.
Though, I could be completely wrong, I know they're all interchangeable from my experience.