I have a 260 on my 2008 hammer, they are basically the same size as the 250. No problems at all. If you go to a 280 or 300 then the rim is too narrow and will cause the tire to squeeze and you will gain height not width, and damage the tire.
I have the 3rd 260 metz on my Hammer I wont go back to the Dunlop. You can fit a 280 but its not recomended for that small of a rear wheel. But hey who really cares whats recomended ....right.
I need a new back tire and I'm thinking of going with the stock tire. Whats the main difference other than size for the METZ 260, does it handle a lot better?