probably a lot to do with the offset they made it for that width. you won't notice the difference between 2" and 2.25" for a lip.
and you really are going to have a very tough time fitting a 9.5" wide wheel. i would vote against it. there's a few people on the forum that i think have the ability to do it based on their technical knowledge and based on your questions i wouldn't lump you into that group. no offense, just trying to help avoid you from having to buy another set of wheels when these dont fit.
