I've always thought the G4 looks a bit goofy with narrow 165/65r14 tires, but they don't bother me as much on the hatchback. I was surprised by the 14" x 5" factory rims, but that's actually a good size for most any tire you would want to run on a Mirage or G4.
Most aftermarket steel rims start at 5.5" wide, & they still work for 165/65r14 tires. I prefer the 4.5" or 5", however.