I just put a 130/90/18 on my '78 750F.
It's REALLY close to rubbing the rear caliper support arm... I thought it might even be rubbing a touch, so I slid a piece of paper that I had folded between them to test it. No rubbing but that's how close it was.

It handles good to me but what do I know... it had a worn out tire on it to begin with! Anything would handle good after that.