Sch is right, none of the tire sizes correspond with different manufactures, which I think there should be some mandatory law that says they should. I was barely able to get a 28 Armadillo on the rear of my bike; I had to deflate the tire and then press the tire flat against the seat tube to squeeze it off. Even now with the Armadillo 26 on the rear, I still have to deflate the tire...but I had to do that with 20's and 23's anyway! The geometry on my bike is very tight.