rx-8 wheels on a mazda6

Does anyone know if you can fit mazda rx-8 wheels on the mazda6? and if so, what tyre size should be used to keep the gear ratios the same?

It would be stupid. It would throw everything off for the car.

I put the 5 spoke 18 X 8 rims on my 2004 6 s hatchback. Tires are 245/45/18. I think it looks awesome! I think the Mazdaspeed 6 used 18X8 rims but a used a smaller side wall tire.