I just purchased two 7R rims for the rear of my 1970 S.

I am using deep sixes in the front with the Michelin XWX 185/70/15 tires. The tires are made in 185, 195, 205 and 215 sizes. Does anyone know what would be a good fitting size for the rear? I have 185's on the deep six rear rims now and can use them on the 7R rims. Do I want to go to a larger size such as the 195 or 205? Some have advised that the 205's may rub. The car is lowered about one inch all around.

Further, should I move away from the OEM Michelin tire so I can use 60 or 65 series tires on the car?

Those Michelins cost a fortune. So, I must make sure that if I use them that I selet the correct size. They will not take them back after mounting.

Thanks for the help.