Those Vittorias are 35mm or 38mm tires.
What tires did you have before? Old and new tires are both 700C?

I always check the first inflation after mounting a tire:

Hold the wheel by the axle, and spin it with a finger against a spoke. I look at the "witness line", a molded-in ridge near the bead. It should be the same distance from the rim edge all the way around. Typically, you'll see it dip down, under the rim, and the tire will be lower there. Reaching over the tread and pulling up on the sidewall with my fingers sometimes helps to get the bead seated correctly.

On my recent install of wide tires, I had to pump up to almost the maximum pressure (75 psi) before the bead seated evenly. I normally run these 39mm tires at just 40 psi front, 45 psi rear. So, I let some air out and set the correct pressures after the bead is seated correctly.

I think that I've occasionally had to deflate, push that side's bead back to the center of the rim all the way around, and reinflate. I suppose a bit of soapy water at the trouble area might help too.

An example of a witness line (at the green arrow).