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@Acliff
6650 chain sets are hard to find, I believe was around the time when roadies were muscling around on standards and the alternatives were triples.
The duraace 7800 of the same generation did not offer a compact option at all.
I have. 6650 165 crank length sort of spare, but a bit hesitant to be rid of it as it took me about a year to find on eBay!