Keep in mind, further you deviate from stock the more you're contorting the tire to fit on a rim that is too narrow for what it was designed to be put on. You don't end up with a wider tire, you end up with a taller one with a pinched crown because the sides had to be pushed in to make it fit.
So, what's the best move? Here are some measures to help you make the right choice.
Oem V-Rod muscle wheel with 260mm tire: (9.85")
Oem V-Rod NRS wheel with 280mm tire: (9.93")
Aftermarket wheel 18 x 10" with 280mm tire: (11")
The width of the tire may vary slightly from manufacturer to manufacturer. In conclusion, you can mount a 280 mm tire on an original wheel but for price and safety, this is not the best deal. The 280 mm (on original wheel) will only give about 1/16" wider than a 260 mm. You can also compare a "real 280mm wheel" vs the 280mm on oem wheel: the difference is more than 1".This feed will be updated soon with more datas.*