I have the 1.6 and 1.3. They can be tight. Make sure the bead that is on, is in the center of the rim which will give you the most room to work with. I have to use my tire tools and go little by little, being careful not to catch the tube.
When inflating, I put a little bit of soapy water on the bead to help the bead seat all the way on the rim lip. You can tell if the tire is not fully seated because when you spin the wheel, you will see a wobble.
Love the tires, they are just tough to put on.