There were at least 3 different cranks called Grand Sport. Probably most common is the 144 BCD which is essentially a Nuovo Record with not quite as fine a finish. Next most common is the 3-arm 116 BCD GS which was OE on the Raleigh Competition GS. Most obscure of the three was the late (early 80's) 5-arm 116 BCD. This one uses the same rings as Victory/Triomphe as already stated. The 144 of course takes a 42T ring, or 41T if you can find one. The 5-arm 116 was made in 35T although these are a bit rare - 36T are pretty common. I think maybe theoretically a 116 might be able to take a ring a bit smaller than 35T, which would apply to the 3-arm 116 BCD as well, although I've rarely seen a 116 3-arm ring smaller than 40T. I believe the 3-arm GS rings are interchangeable with 3-arm TA, Stronglight and perhaps Nervar.
Besides the above, I beieve there was a steel cotterless, as opposed to alloy, version of the 3-arm GS. There may even have been a 5-arm 151 BCD version for all I know.
Regards,
Jerry Moos Big Spring, TX
Doug Van Cleve <dvancleve@gmail.com> wrote: If you mean the 116mm BCD late model it goes down to at least 35T as Greg posted. I had one of those, but sold it earlier this year. OT Victory and Triomphe cranks also used these chainrings.
Doug Van Cleve Chandler, AZ
On 1/3/06, Amir Avitzur wrote:
>
>
> What is the BCD of Campagnolo's 5-arm G.S. crank set?
> What is the smallest Chainring that will fit in that crank?
> Where can I find such chainrings?
>
> Amir "not-a-Campy-fan" Avitzur (but I do love their shiny chrome steel
> headsets)
> R"G Israel