It should be noted that by having small/thin tires on the back of the car, the steering is very "boatish". By boatish I mean she has a boat-tail effect to her, so at high speeds she's very unstable. It's like pushing a shopping cart in reverse.
I can't drive her beyond 55 mph in this configuration. Since she's my commuter car and I work close to home I don't ever need to drive her any faster, so it works out quite well.