I am not as educated on this disk as I should be but I looked at one the other day and the cast iron carriers on the main frame were worn out and one was cracked almost in two. I think when they were in good shape they did a decent job and for 7500.00 I think it should be in good shape. I bought a 31 foot hutchmaster this winter that needed a little work, tires and the front blades are around 19 back are 22. I hope it will run one year. It is a good heavy disk and does a good job. I pulled it at 6.5 mph on milo ground the other day and it leaves the ground very level. I gave 2500.00.