^^^ I bought a used bike so equipped. '89 Trek 800, which shipped as an 18-speed with a freewheel and thumbies. PO took it to a bike shop to replace the rear wheel, and they installed one not only with a 7-speed cassette, but 135-mm OLD. They just spread the triangle to force the wheel on. And indeed, it did just BARELY managed to hit on all seven with the "ghost" position, albeit not very well. (Okay, not well at all...) Fortunately I found 130-mm wheel and 6-speed freewheel for it; works MUCH better with the proper kit.