Ok so i have a set of 13 inch steel wheels that are stamped from factory as being 5j wide, I'm guessing means 5 inch wide. Thing is i have no idea how wide i can go from the norm with tyre sizes. At the rear i was hoping to go approx 2 inches wider as i have the room, but on the front 1 inch on the outer edge is i guess my limit.Could anyone give me an idea of tyre size that would then fit. I have seen minilites that are 6 x 13 and 7 x13, but havent got a clue as to what size tyres would fit the equivalent width steel rims. Many thanks for any advice.