This might help you.
http://www.valkyrieforum.com/bbs/index.php/topic,65849.0.htmlBTW - I just put on a 205/55-16 Yokohama Avid Envigor on Lesa's bike.
The un-inflated overall tire width was right at 8.5"
The inflated tire width at 36psi. was 7 5/8 - 7 3/4" just for your reference.
Hope this helps! The nut cage mod is a piece of cake.
If you are doing a different bike (Tourer or Interstate) and use different hardware it would be nice of you to add to the above thread so others can benefit from the information.