Dunlop recommends an 8.50 rim for the 250 rear tire. What is the downside to putting it one on an 8 inch rim?
I was hoping to double check the Dunlop website yesterday, since they usually list a range of rim sizes for their tires, but the site seems to be down. There is a possibility that the link you listed just picked up the recommended rim width, and not the full range of acceptable widths. For some strange reason I seem to remember looking this up for someone in the past and finding a range of 8.00 to 9.00, with the recommended value being 8.50". Maybe if they ever get the site working again we can confirm.
The importance of using the correct rim width has to do with how the forces travel within the tire carcass, and also how the tread area contacts the road. You can see the obvious problems if you install a tire on a severely mismatched rim size, but the issue isn't that obvious (or serious) if you're talking about a small difference. The reason I won't personally recommend something other than what the tire company says is acceptable is that I'm not privy to their data. There are areas on this site that are subject to opinion, which I will often give freely even when not requested. However, when it comes to something that could affect someone's safety, facts are important, not opinions.
JMHO - Jerry
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