We had a long discussion about this a while back. Don't know where that thread is, I suck at searching, but I can briefly go over what works and doesn't work on our 69 RS Z.
With the stock rally's the 215-70-15 is nearly identical in size to the original E70-15's the car came equipped with, and are the radial equivalent, they work perfectly fine.
I've had 225-70-15's on the front, and they work but they are a pinch wider and taller, and get very close to the top of the wheel well. In certain turning situations and odd angles they would very lightly rub the top.
I switched to a 215-65-15, slightly shorter but slightly wider. This also seems to work okay but again, only on very odd angles and tight corners I get a mild rub at the top of the fender. These are currently on the car and daily driven, the rub isn't enough to worry about.
When I need another set of front tires I'll go back to the 215-70-15. That size worked fine, cleared the RS plastic covers and doesn't rub the top of the fenders.
On the back I run 255-60-15's. They fit fine with no rubbing anyplace. however I can barely get my finger between the side wall and the wheel well lip, and have actually cut my fingers several times while cleaning the tires. It's that close. I wouldn't dare try anything bigger on mine in the rear, it would most certainly rub.
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