Avon 250 is actually wider then Metzler 260, just FYI.Welcome to 1130cc.com - yes the 250 tire will fit on your 8" rim as has been done by many members here.. Do a search !!!
The more common upgrade is to a 260 tire on this bike
I might be mistaken but I think I read that a couple people put it on the stock swing arm with no clearence issues. Granted it's tight but it does fit without hitting anything.If you're going to put a 280 on then you're going to need a wide swingarm and if you are going to b paying a couple grand out then you might as well put a 300 tire and kit on, which will cost you a new tire, wheel and swingarm. All in all...give or take 4G's.
Ya..the odd odd guy tried a 280 on a stock wheel. Jury is still out on that. So it all comes down to what you want to spend.
As for what's wider...a 250 or 260 Metz....many debatable threads on that too.
Well...bottom line is anyone can push the envelope a little and going a little more than manufacture recommendations and put a 260 on although I don't consider that a push, but a 280 is a shove. Sure it squeezes in it seems and the walls in the thread look like they are going to pop but manufactures usually test products under many circumstances over years. 2 people or even 15 who have tried that setup so far might only tell me that they still have lady luck with them. But at some point you got to admit that maybe I should listen to the engineers.The 280 Metz fits, i have another vrod in town that put one on his stock rim with no problem along with a ton of guys from the post above. Im just waiting for my tire to wear out and thats what im planning on. Looks awesome!