HX Sandman Build - Rim & Tyre Query

[Valencia]

Hi, I'm currently building an HX Sandman and am wondering what is the widest/best fit for rims (GTS) & tyres (BF Goodrich or Eagers). I was thinking 15” x 7” GTS rims with 4” backspace for front and 15” x 8” GTS rims with 4.5” backspace for the rear. Any thoughts would be appreciated!

15x7 225 or 235/50/15 / 15x8 245 or 265/50/15 these sizes are available
either of these combo will work just depends on the look you want
i once had van with 265/14/50 TAs on an 8 inch rim lowered no rubbing on the front decades ago
wouldnt today of course