Campagnolo double chainsets up to the late 80s can fit a minimum inner ring of 42*, so you can't get a 39. From the late 80s on (Athena, Chorus, etc.), you can have a minimum 39.
-> late 80s: see http://velobase.com/ViewComponent.aspx?ID=835418D8-07C5-4BFF-B006-54EC670E7ECE&Enum=115&AbsPos=42
late 80s ->: see e.g. http://velobase.com/ViewComponent.aspx?ID=5E576976-60FD-40DD-A0C9-03847B68D23F&Enum=115&AbsPos=15
Nick
@nammonk started
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Campagnolo double chainsets up to the late 80s can fit a minimum inner ring of 42*, so you can't get a 39. From the late 80s on (Athena, Chorus, etc.), you can have a minimum 39.
-> late 80s: see http://velobase.com/ViewComponent.aspx?ID=835418D8-07C5-4BFF-B006-54EC670E7ECE&Enum=115&AbsPos=42
late 80s ->: see e.g. http://velobase.com/ViewComponent.aspx?ID=5E576976-60FD-40DD-A0C9-03847B68D23F&Enum=115&AbsPos=15
Nick