I have 5.5" rims on a VMC build with IRS. The tire-to-rim convention I'm familiar with (on a much wider rims) is the tread width should be 1/2" less than rim width. On these Speedster rims, that math means the tread-width (and tire) will be too narrow.
TireRack.com lists manufacturer specs which suggest a range of rim widths that work with various tire sizes and consistently states a 5-1/2" rim is the narrowest rim for a 195/60 application. The Vredestein Sprint + in this size has a 7.7" section width and 6.2" tread width. On the other hand, the Goodyear Eagle RSA has a 6.0" tread width...that's getter closer to a "balanced" sizing. Two different looking tires, but same nominal size.
I bring this up because this defies my understanding of tire sizing, so I want to ask you what you're running, if you're happy or what would you do differently? I've come to drink from the well of wisdom.