I just got this wheeler,and it has brand new Kenda Rampage tires.The rear tires are at the point where you can just about see the air in the tires.I am thinking these tires are not what I want/need.My question is this,Do I just buy two more of these tires so they all match or do I sell these and buy what I want?? I have NO clue if these tires are worth the rubber they are made of,so I am open to ideas and suggestions......Thanks in advance