Wheel Fitment
 

Will 215/45 18R wheels fit on the FC???

Your question is too vague.

What you listed was a TIRE size, fitment depends on the wheel width, height, and offset.

Give me the height, width, and offset of your wheels. We can go from there.

Go here for all your FC wheel fitment questions:
https://www.rx7club.com/suspension-wheels-tires-brakes-20/official-fc-wheel-fitment-thread-257700/

I'm not sure what they are...
There the RX-8's tho

Rims Size:18"x8", 5 Lugs 114mm With 50mm Offset.

You'll need a huge spacer to use those wheels.

http://fc3spro.com/TECH/MODS/RT/rims.htm

What do you mean???

In the back or all around???
What size do you think???

Thank you for your help!!!

that's a pizza cutter of a tire. why such weak tire width? If you're gonna go with 18s you might as well have some width on them, 18x9 front 18x10 rear would be nice.