The rim is 18 inch, offset +30 and 8 1/2 inch wide, PCD
114.3. can any bros here advise whether it can fit our 8?? found a set of these sizes, but don't know whether it will rub against the arches or not... I am getting the nismo monoblock...

cheers

 

Nizmos on a mazda??Well if you insist yes it will fit i believe.Someone has a 30 offset on rear with a 19.Someone else confirm front fit?

 

It will fit, but barely. You will need a 245 tire or smaller.
If you can get a 35mm offset, it will fit the bigger tire more comfortably.