other than you dont know what kinda tire your gonna get, like what the sidewalls look like, you are buying used tires with a recap tread on them... and by the time you pay for shipping and mounting and balancing you may as well of just bought some new tires that have a warranty, -sure tread wright has a warranty but you have to ship the tire back to them and wait and wait for them either approve or deny and then ship you a new tire(you pay for that shipping too) where as you could buy new ones from say america tire and if you ever have a problem then they will fix it no cost to you... and no waiting on shipping or anything like that.