I am the proud owner of 6, count them, six, Genuine ShimaNO BioPace rings.
I want to keep one smaller one, just to remember the reckless deformity of the design, and the chutzpah of the marketing. It will become part of my Great Moments in Cycling Design collection (with the Campag. Gran Trashmo and the Campag Sport RDs, and early plastic Simplex (if there are any in captivity with the original plastic front clamp), and a "plunger" FD. Ah, and the late 50s? Normandy HF hub with the left flange pushed out as far as possible, to maximize right side spoke breakage. Glad I kept that one. Should add a stripped out extractor thread Stronglight 57/63/93/99 crank arm, with its bespoke remover just a silly 0.1 mm bigger than the TA The TA fits, just a bit loosely).
Returning to my offer, I will happily give away all or any of the other BioPace rings for the actual cost of shipping. Ring sizes are 28 (74 mm BCD), 38, 44, and 48 (110 mm), and 42, 52 (130 mm). Not surprisingly, the condition of almost all is very good to even better (you didn't think very many people rode this stuff very far, did you?)
Preference is to ship all to a single address. but I'll accumulate all requests for a day or so and decide somehow, probably on the basis of the creative uses proposed. That might even include a preference for perverse-but-perfectly-correct restoration of a bike to its original beknighted specification. Oh! I forgot: they are each indexed to crank position, so they can be installed correctly when drunk.
I'm just hoping that someone cares; it is time for me to quit curating quite so much. If they were copper, I'd melt them for the $$. At least one is steel, so you'll get a long life from it. The others are guaranteed for your lifetime, if they hang on an inside wall in a conditioned space. :-)
It's a slow evening, with lots of tasks that don't want to be done...
harvey sachs mcLean va
PS: Might trade for a Durham true elliptical, and throw in a bit of $$. If Sheldon Brown agrees to consider inventing a sliding front derailleur to track it up and down the seat tube, to get better shifting. Or maybe the derailleur could be fixed in place, but the BB move up and down, with the rider and a coupled seat post? :-) To be contemplated in early Spring.