Why can't I get this new tyre on my bike?

Never had a tyre that wouldn't go on with thumb power alone, folding or wire bead.
http://www.angelfire.com/id/croon/india/thumbs.html

Thumbs Denote the Will to Power Professor Sir Richard Owen, in his monograph On the Nature of Limbs, calls attention to the fact that the "thumb, which is the least important and constant digit of the anterior extremity in the rest of the mammals, becomes in man the most important element of the terminal segment, and that which makes it a hand properly so called."