I know of two shell variations and two skewer types.
SHELL:
the ones shown on the CR site are the later (?) one-piece aluminum hub
shells (url is below). The earlier (?) three-piece, with aluminum
flanges and steel barrel, is shown at
http://www.43bikes.com/
SKEWERS: Bob Freitas and I discovered that these come in two flavors, too. but I don't know the chronology. They do NOT interchange. Both styles use a special thread cross section, sort of like a buttress (?) thread. One style uses a conventional single helix. The other style uses a double helix, so it advances and locks much more rapidly than the single helix version. It can also start in two positions 180 degrees apart, and thus lock in two different positions. The skewers themselves are very complex, with three sets of threads on them - one set left handed and very small. Bob and I were very short of skewers, so I commissioned three reproductions from a machinist friend. One is left, which I would sell at cost, $75 plus shipping. Please note: this is the naked skewer, w/o the handle, locknut and other accessories.
harvey sachs mcLean VA.
Kurt Sperry wrote:
> Questions to list: When were the Bivalents begun and discontinued?
> What visible variations did they go through through their production?
> Were they ever (and if so when and where) either standard or optional
> fitment new on Cinelli bicycles?
>
> Kurt Sperry
> Bellingham, Washington
> USA
>
> On Thu, Feb 11, 2010 at 4:35 PM, Harvey Sachs <hmsachs@verizon.net> wrote:
>
>>Jerry Tenenberg asked,
>>Can someone shed light on the typical wheelsets that were found on 70 - 73
>>Cinelli SC's?
>>+++++++++++++++++++++++++++++++++++++++++
>>My SC originally came with Campag Record high flange, but I think that the
>>equivalent small flange would be fine - that was popular on Masis of the
>>era.
>>
>>Of course, the flip answer is that Cinelli SCs of that era are not properly
>>shod unless they're wearing Cinelli BiValent hubs. Preferably the second
>>generation (one-piece hub shells, which broke less frequently than the
>>three-piece), but either the single or double helix skewers are acceptable.
>>http://www.classicrendezvous.com/Italy/Cinelli/Cinelli_parts.htm
>>
>>harvey sachs
>>(who got his BiValents when they were way, way, unfashionable)
>>mcLean VA.