Hey there, new ninja owner here. I recently purchased a 1996 Ninja zx-9r and the rear tire needed to be replaced. So I searched the specs online and found the rear tire size to be 180/55 17 so that's what I ordered. But today, I looked on the tire thats on the bike right now and it says 190/50 17....The rim is the stock rim as far as I know so can you put different size tires on the rim? Did I order the wrong size? Thanks in Advance.