There has been a similar concept made by a small german company WECO later. You can remove the rear wheel with the body of the hub while the whole freewhell remains at the bike. It was available in the mid 90s (but only for "on topic" high end randonneurs). My wife has a nice "Norwid" stainless steel Randonneur bought from Carsten Rehbein with these hubs. (Earlier version of http://www.norwid.de/
Dirk
Dirk Feeken Heidelberg Germany
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From: "H.M. & S.S. Sachs" <sachs@erols.com>
Subject: re: [CR]Bivalents on Ebay
Date: Tue, 08 Oct 2002 22:21:15 -0400
>Your mileage may vary, but it was a great concept. Don't have to shift
>gears to change wheels, since the FW part stays on the frame. Even
>included a little "Y" that bolts to the little tube connecting the
>chainstays, to make placement a bit more automatic!
>harvey sachs
>mcLean va