Here's a pic of my car with 205-60x15 tires on the front and 305-50x15 on the rear. The 205-60x15 tires have a diameter of 24.7", so only 0.8" larger than the 225-50x15 tires, which is negligible. And FWIW, I had no rubbing issues with the 205-60x15 tires on 7" Campys up front.
ADDITIONAL NOTE: This pic was taken with the original spring spacers still installed on the car.