Dave:
GS, just like Record and Nuovo Record, changed spindle lengths in late 1977 due to the revised RH crank arms, which was due to the addition of the "CPSC bump" in the front of the derailleur cages.
GS double spindles then went from 112 (68-SS-120, BSC & FR) to 114.5 (68-SS), and from 113 (70-SS-120, ITAL) to 115.5 mm (70-SS).
What you have may be a post-1977 GS double spindle (depending on its exact length, which you haven't specifically told us so far), but it could be called something else / used for other cranks as well. Campy had a confusing array of lower-tier products in the early/mid 1980s like Victory and Triomphe, CDA and Chorus, and Xenon and Athena. Xenon and Athena, for example, both used (black) GS-type spindles (for thin-walled cups) of 114 to 116 mm. However, they also used black spindles of 117.5 mm designed for thick (NR-type) cups at one point! If the spindle you have is 112 or 113 mm, and has spacing for thin cups, it could be Victory/Triomphe.
In any case, you need to measure the A, B, C, and D dimensions called out on page 3-31 of Sutherland's Fifth Edition (for example...) to really know what you have.
For stuff like this, Sutherland's is invaluable IMO.
Regards,
Greg Parker A2 Michigan
Date: Wed, 17 Mar 2004 22:29:16 EST From: Bikerdaver@aol.com To: Classicrendezvous@bikelist.org Subject: [CR]Campy Gran Sport BB Mystery
Folks- I have what I thought was an ordinary Campy GS BB. I thought I was familar with this model going back to the early 1960s to whenever they ended production in mid-80s. The axle itself, I always believed, had been a solid one piece affair with a published length of 115mm+/-. However, I have what I was sure is a GS axle
that is hollow just like a NR/Record/C-record/chorus.
The length also makes me rule out Triomphe/Victory/Athena/etc. It is
still black colored like I always thought GS to be and it also has the "winged
wheel" logo as found on GS components.
All the catalogs that I have read containing GS info do not seem to
indicate that GS BB axles were hollow. Does some one have a later 80s catalog
that
describes a hollow GS axle? [sorry for being out of the CR time line with that
question] and if so, is there a date in which this change took place?
Never the less, it seems to be totally up with fine milling and
workmanship that we have all known and come to love/covet/etc. about Campy
components.
What particular item/version do I have?? Any help would be most appreciated.
cheers-
Dave Anderson
Cut Bank MT