Technically the Pro wheel (which I believe is 7" wide) is outside the envelope of recommended wheel width for 285 wide tires. 275 is the widest that fits within tire manufacturer recommendations.
Thus, in theory you could slip a bead easier if you were aired down in this configuration. There are plenty of people on this forum who have run Pro wheels with 285s without issue though (that being said, I am not one of them).
