Abstract: A device for removing the wearing surface of a tire before resurfacing includes a pair of disks detachably fixed together and having a common peripheral groove of partial circular cross-section. A number of ring-shaped cutting bits having cutting edges at each end, each formed having a number of outer surface grooves parallel to the ring axis for causing a rough cut, are equally spaced around the disks in the peripheral groove, with part of the ring cutting edges exposed. When the disks are fixed together, the rings are clamped in the peripheral groove, secure holding of slightly different sized rings being enabled by slots in the disk circumferences which form sector parts each holding two cutting bits. Each ring may be formed with an outer, encircling groove, enabling the rings to be strapped to the disks for additional holding security.