As you say, just for looks... and that will really depend on the tyre you choose. I run 305s and the General Grabber AT2s I had looked much wider than the BFG KM2s, both in the same size (305).
So if you go from a 285 ‘square type’ tread to 305 ‘mud terrain type’ you may be disappointed...
So it really depends on the type of use you put them to and the actual tyre you buy (make and type).
Thats crazyI am so jealous of these tyre option threads.
In Spain I can not fit a snorkel without an engineer's report!!
Regards
Dave