As mentioned, Conti tires almost always run smaller than stated size, I'm sure this is of marketing value so they can claim their tire model X and size Y as lighter than other tires of supposed equal size.

I, like Stuart above, have never really had difficulty in mounting Conti tires, maybe part of that is technique and part likely due to certain tire-rim combinations are tougher than others.

Just curious Stuart, what rim did you have trouble with the tires not remaining seated?

I have had two Conti gatorskins recently where the bead tore away from the sidewall and left me stranded as it wasn't bootable, but I have owned and worn out several sets of gators over the years.