Tire size??????

so i just scored some nice chrome rims and didnt get that much info as far as size and what not. but they do measure 17.5 in diameter and 7.5 in width. (stock chevy something) just wondering what size in a 50 to a 55 series can i run????

225 I believe bro. that will fit perfect and flush with the side wall

gm offset same as z71s ?