New here today. I bought an old rusty L2250 for $800 and the front tires are bad (not worth putting tubes in) . Here is my issue, I looked up what tires it takes and it says 5-15. There are 6-14 tire on it now and when I look up 6-14 tires i get two differnet diameter sizes, 25.8" and 26.5" so i...