I wouldn't know about the measurements or any of that, but I wouldn't go with any bigger than 17" wheels for two reasons 1). Your turn radius is affected & 2). The bigger the wheels the heavier they are, affecting not only fuel economy but also your speed sensor which would need to be calibrated for the new size. I wouldn't wanna bother with all that.
I got 99 problems but my Focus ain't one 🚘