I have the stock size tires on my 440. They are 21in by 3in. Will it screw things up if I put a smaller rim like a 18? I am 5'9'' ant the bike is to tall for me, I have to be on my tippys with the bike standing up perfect, I have to tip it to the side to plant my foot. I have made the rear shock about as soft as it will go to sink for me. Go ahead and poke fun at the short guy on a big bike and tell me to get a smaller bike but if there is another option I will take it, I like this bike. :coocoo: