Here is the link that I started regarding wide tire/swingarm stuff with some good info. I'm in the process of fabbing a whole new swingarm to harbour a 180-70-16 Avon tire on a 5.5 Excel rim laced to a 76' hub with offset sprockets. Only want to do it once, hope it all works. Bought enough pipe to build a few swingarms as my fabricator bud and i talked about producing a few of them. My frame is a Santee Rigidarm but of course is made for a stock swingarm. Trying to come up with a swingarm design that will work with all frames, rigidarm, early and late model....don't know just yet if thats possible. Hope this link works.......

http://hondachopper.yuku.com/topic/13601?page=1