TKO have introduced their new flat & finished diff rings for the Associated B5 and a range of pan cars. Using their ‘Totally Flat Technology’, TKO claims to have produced the finest diff rings available. Using a proprietary process, the rings faces are flat to within 2 microns. and the faces are parallel to within 1 micron, one micron being 40 millionths of an inch (.0000040). The faces have a #7 finish to provide traction for the diff balls and they fit flat on the hub for near zero run out.