Nubs on Cop Wheels

I don't see a problem with those, but I don't think I'd mess with 195's unless you're looking for that skinny wheel look up front. The 255's out back should be fine, and I would just run 225/60/15's up front. It's a good sized tire, fills up the wheel opening, and shouldn't require much if anything in the way of fitting/trimming. You could also consider 215/65/15's, they're a little narrower so the fender lip would be less of a concern, and they're 26" tall so they'll be a little closer in height to the rear tires. And they should still fit, although you might have to do some adjusting of the lower fender to bumper brace or maybe some trimming at the bottom front corner of the fender lip.