Anyone running the 15x7 rallyes?

I just found two 15x7 rallyes at the yard, but passed because one of the rims had waves in the metal, must have been put under stress or something. I'm just wondering if anyone is running these rims in the back, and what tires they've put on there.

 

I think the max size per the tire manufs. is 2.75 x 15. I have seen people say they nevertheless have squeezed a bigger one on the rim.

 

I have 275/60's all around my Rivi. They wear very evenly.

 

Do they fit fine in the back, how much sidewall "squat" do you get with that size?

 

They fit rather good actually. I will post a pic a little later for you to see.

 

Pictures of tires
I know they look quite cracked, but the car just sits on them. The front end is off of the car and the rest of the body is next so I can start a "frame off". the tires actually used to be on another Rivi I used to have. I originally bought them in 1987 believe it or not, but I don't drive on them.