Grinding wheel too big? Let Mach-B Grinding Wheel Shaping and Resizing take your wheel down to size. Just as with enlarging IDs, we can reduce your grinding wheel OD by as little as .001″ or as much as you need. The only limits are those that will affect the safety and stability of the grinding wheel. All wheels are sized 0.10″ to 0.15″ oversize to allow for final dressing.