You can save yourself a lot of money by making your own comparable wheels using 3/4" MDF particle board or 3/4" Melamine board which is used in cabinet making. Use a circle cutter jig to rough cut to a diameter of 255 mm then glue pieces together to make whatever thickness you desire. Rotate rough wheel on a wood lathe at 400 to 600 rpm and, while rotating, use an angle grinder to smooth and reduce the diameter to 250 mm. Drill a 12 mm (31/64") hole in center for mounting on Tormek. Dress with whatever honing, cutting or polishing compound is needed. I use one of these wheels, which is 3/4" thick with a raised rounded edge, for sharpening fluted or hollow edge knives. Some of my wheels are over 20 years old (used on 8" grinder running at 3,450 rpm) and they have not shown any appreciable wear. They hold the dressing compound perfectly. If you are using melamine, lightly grind away about 5 mm on the outside edge so there is no plastic that touches blades as you are honing.
The nice thing about these wheels, other than low cost, is they run perfectly true at low or high speeds. The same cannot be said for many felt wheels.
The nice thing about these wheels, other than low cost, is they run perfectly true at low or high speeds. The same cannot be said for many felt wheels.