If it's a wider tire on a narrower rim, I suppose proper inflation pressure is a legitimate concern. I wouldn't run my 35mm Paselas under 50psi on my 17mm Alex rims, but you probably wouldn't, either. As long as the bead seats solidly and the tire is quite firm for your weight, I can't see how there is any any problem.
If the tire is so soft that cornering hard pops the bead out; then you have a problem.
