Many many years ago I ran into that problem with Continentals and whatever rims I was running on my GT Strike road bike. This would have been the mid ninties. Long story short wheel and tire sizes are nominal and have slight variations between manufacturers making certain combinations of tire and wheel incompatible. On the opposite side of the spectrum I once ran Avocet touring tires on some wheels and they had a tendency to walk off the rim. Again, a long time ago.