"offset is directly related to rim width- you can certainly use a +55 6.5" wide rim, but you cannot use a +55 8" wide rim!"
Just a suggestion: this isn't necessarily true for any other car but the Impreza/WRX. This is a Subaru site as much as a WRX site. I think it's important to be as explicit as possible for a thread that's going to end up in the FAQ.
I'm just worried that people might be confused by such a general statement.