ola, enrique,
On my 200Sx I had 225/45 on 17"x7" at the rear axle.
on the front axle 215/45.
It's the same size as on a 300sx, but the 300sx has on the rear 17"x 7,5" Rims.
225 is the max on 7" wide rims.
The size 225/45 givs the same speedometer reading as the original 205/55 16".
Pic:
and one in your neighbourhood:(click) B)