The tires you want to run will fit on the rims you chose. A 10.5 rim can hold up to a 315, and a 9 inch rim can hold up to a 275, if I recall.
I run 18/9 front and 18/10 rear. Front is 245/45/18 and rear is 305/45/18. I didn't want a wider front tire because I am already low enough to where I don't want a wide tire causing turning problems on uneven roads. That's just my choice because Louisiana
has terrible roads. Lol
2016 Comp Orange GT (current)
Aurora - 2002 Boosted GT! (Sold, sadly)