Not that this matters to you:
I autocross with 13x7" mini stock wheels with 5" backspacing and 205/60R13 R tires (38psi all around). The front tires rub the plastic inner fender shields, and the rear fender edges needed to be rolled for clearance.
I am running Tokico springs and "blues," and ST bars. I have -2.3° camber front and -1.3° camber rear, and 0° toe. I have a hand-fabricated front STB. I have been fighting oversteer all season.
I run 15x6.5" 38mm rims with 195 Kumho 712s on the street (35psi all around) and have no complaints. Check your alignment if you are understeering excessively.
I am looking at going to 13x9's and 235/45R13 V700's in a few years, but have to check for clearance first. I will run 215's next season.
Greg
http://www.geocities.com/g_wellwood/...ve/sentra.html