[Silly Little Cars] Go-4 Q's: Wheels and Brakes & Suspension

[goaliefergy1 at aol.com]

Has anyone put a larger pair of wheels on the rear of their Go-4? I found a pair of 15x7 Mazda wheels with the same bolt pattern and offset. I'm curious if they would stick out too far or not, if I get them I'd need to get 195/50r15 tires to keep the same stance and speedo reading. 
http://www.1010tires.com/Tools/Tire-Size-Calculator/155-80R13/195-50R15

I like the idea of a slightly wider rear wheel for grip and stability, but not so keen on if it'll stick out too much.

Also, the rear suspension and brake components are those of the Ford Festivas correct? Only my to-do list is to check the status of the rotors & pads and also order so new rear ("front") struts.
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