Surly Lou rubbing against front derailleur

I have a 2015 Specialized Fatboy and I just changed out the original Specialized Ground Control (26 x 4.6) for the Surly Lou/Bud at 26 x 4.8. The tires clear fine width wise, but the rear tire (Lou) is rubbing slightly against the front derailleur. Short of changing out a brand new tire, any suggestions?

Thanks!