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I just finished with a set of 15.5's that turned out real nice. I got a cutting disk and cup from a guy here in TX. It is designed for cutting tires, and I would not dream of using anything else. It was $60 for the tools, but you would go through that much sand paper if you tryed to do it that way. You want to start with 36 grit and do the initial cutting. If you get the cutting cup, you will want to debur the bottom edge so you dont have it grab and cut through the tire completely like I did. Once you hit cords, you can make a mess if you dont debur the cup. You will use the disk to cut the top of the lub down and lay it back, and then use the cup for the front edge. Be vary careful and wear long sleeves welding gloves and eye protecton. Those things can get away from you, so be careful. You can then go back with 80 grit on a disk or belt sander and finish out the tires. This will make them look a ton better and last better. Be ready to get real hot, dirty and not have much fun for around 18 hrs. Might not take you that long, but that is about what it took me. When I was done, mine looked machine cut cause I am real picky.
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