Hopefully this will help some. I didn't explain that very well above.
E/70-15 is 8.4" section width - 26.73" dia - 6.63" tread width
F/70-15 is 8.4" section width - 27.09" dia - 6.34" tread width
F/60-15 is 9.23" section width - 26.27" dia - 8.25" tread width
Radial 215/70-15 is 8.7" section - 26.9" dia - 6.5" tread width
Radial 225/70-15 is 9" section - 27.4" dia - 6.9" tread width
Radial 215/65-15 is 8.7" section - 26" dia - 7.1" tread width
Running that 215/65-15 radial on my RS, clears the actuator cover, but it will sometimes lightly rub the very top inside of the fender when backing up and turning sharp over a bump. All those stipulations have to be met to have any rub. Otherwise works fine, it's just shorter than I want.
Given that info, on mine anyway, I could go straight to the 215/70-15 and it would work. Tread width is less so it would clear the top of the front fender, and also give me more clearance for the actuator cover, even though the tire is slightly taller, less width makes up for the room in that area.
The 215/70-15 is also the closest radial match to the factory E/70-15 Z/28 tire, and we know that fits. Going to the 225/70-15 radial may also work but it's probably pushing the limit of height and width for clearance on a stock RS Z ride height. These things sit lower than other 69's, and the RS stuff takes up room in front of the tire.
Looking at that F/60-15 bias, I'm pretty certain there is no way that would work, not without raising the front of the car with more spring...maybe. At stock height though, it's too wide for sure.
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