i got this information from Soul_survior...so i thought i would share it with everyone.
you can put a 180 tire on the stock 4 inch rim and it will fit within the swing armon an America. But it will be unsafe and you may lose a bead which will could result in you crashing. Any tire 180 or bigger should be mounted on a 5&1/2 inch rim. The 'wide tire' kit BC sells allows you to fit a 180-210 tire on their 5&1/2 inch rim and is sold with the correct offset which is important. To my knowledge BC is the only company that has taken the time to calculate the correct offset. My photos under 'custom' shows a 200 mounted on a 5&1/2 tire on my America. If you have a T-100/bonneville the widest you will be able to fit is a 180. BS sells a wide tire kit for those as well. A 200 will not fit on a T100/bonneville