A special trailer tire in size 235/85-16 can mount on a 16-inch diameter rim of several different widths, 6-, 6-1/2, 7- or 7-1/2-inches.
On the page I linked for you are all 16-inch aluminum trailer rims which are available in these different widths. These rims are offered in two wheel bolt patterns, 6-on-5-1/2 as with HWT Aluminum Split Spoke Trailer Wheel # AM22658HWT and 8-on-6-1/2 as with Lion's Head Bearcat Trailer Wheel # 274-000039. At the top of the page simply click on your bolt... view full answer...