boobstar

I was wondering if this is an adequate tire size for the rear Supra TT WITHOUT stretching them dramatically. The tires are Goodyear Eagle RSA. My dilemma is that I have a set of new 225/50/17 (fronts) and 235/50/17 (rear) in the Goodyear Eagles and I have a decent set of Sumitomo HRZ II 275/40/17 for the rear. I am trying to find the most cost effective solution to replacing my worn Sumitomo fronts, use the complete set of Goodyears (what I would like to do if my rears can fit without sctretching) or replace the fronts with new Sumitomos.