So I've got 15 x 7 steel wheels all painted up and ready to go for my car. Now the tire choice comes down to two different sets of sizes.

I was all ready to go with 215/70R15 in the front and 255/60R15 in the rear these are just under 27" tall in the front and just over in the rear. Now I've been told that I can go with a 275/60R15 in the rear and step up to a 225/70R15 in the front. Question is the 275 to wide for a 7" rim and will it cause any problems rubbing and such on the car. I would really like the wider tire, but don't want any issues.