[General Katana]

Hey guys (and girls) just picked up a new toy. Money was tight had to get rid of the gsxr but I picked a a great running 91 Katana 750, for a couple hundred bucks. I am looking to get a fatter back tire though. I was wondering if anyone knew if the rumor was true, that a gsxr swing arm from the same year will allow for a fatter tire. Any info would be greatly appreciated. Thanks