Not a lot of room back there.
I'd say stick with the stock tire,
(160 / 60 ZR 17 MC 69W), and be done with it! (IMHO)

I just had a set of front and rear
SHINKO Raven radials installed on mine. They were $100 cheaper, (each), than comparable Pirelli's, and besides, they don't make the Pirelli Angel GT's anymore.
NOTE: I got about 10K mileage out of the Pirelli's...which is not too bad, I guess..