Would a series 4 fit rx8 rims

225/45/18 on 18s offset is 50 i believe

any ideas on how to make it fit or if it will fit at all...

thanks

 

If the offset is 50mm then you may need some wheel spacers to push the rim out like people use who put on FD rims.

To determine if the diameter is correct, use a tire calculator:
http://www.rx7turboturbo.com/robrobi...e_diameter.htm
It says the stock RX-8 rubber should be 26" in diameter while the stock FC rubber eg. TII tires 205/55/16 is 24.9".