May sound crazy but how is tire diameter measured? When I convert my original 600 15 tires to radial it give me 185/70 15 but when I check the diameter on google it gives me 25.2 inches. My original 600 15 measures 26.25 at the max diameter when just using a tape measure. From what I see it looks like 205 70 15 is the same diameter at 26.3 but it would be to wide. I can’t find anything in whitewall that is even close to the correct size. Not sure what I am going to do for tires yet but I really want to keep the 15’s.