____ Well Matt, your post is fairly-well written to make your point clear enough, and everything you've covered all makes good-sense. _ And it COULD be GOOD-info for all to know and MAY very-well indeed be completely true but, I still think, ("think", because my memory may have slipped on this issue), that it's possible that you really don't have all the actual-facts completely straight on this. ...double diamond wrote:The sprocket drive plates (or flanges as they’re referred to in the parts catalog) manufactured by Grimeca have the six radial reinforcing ribs. These flanges are identified as Grimeca by a “G” cast into the flange on the inside facing surface. Grimeca also cast a manufacturer identifier into the brake shoes. The Agrati-Campagnolo brake parts have a four digit number and/or a lower case “a” cast into the parts. Grimeca parts were not installed at the factory on Campagnolo hubs or vice-versa. The Campagnolo sprocket flanges were often replaced with the Grimeca flange when the Campagnolo flange broke (not uncommon) since Ducati continued to employ Grimeca parts into the 1970’s while the Campagnolo parts were discontinued in 1965. All illustrations/photos of 1965 Ducati models with Campagnolo hubs have the smooth sprocket flange; the reinforced Grimeca flanges were OE for the 1966 and later models with Grimeca hubs. Matt
__ To make it fully clear as to what the 'issue' is, there are two main types of rear-sprocket carrier-plates - the newer-type with 6 added flange-ribs, and the original smooth plain-type. _ And the question is exactly WHEN did the change (from the older to the newer type) actually take place !?
Well Matt, it seems that you base YOUR (stated) belief on "illustrations/photos" *, while I-myself get MY belief from my-own (possibly faulty) memory (based on direct experience with at least a 100 n-c.Duke-models). _ And I'm fairly-sure I recall that the newer-type s.carrier-plate came stock on pre-66 rear-wheels as well ! _ However I'm not real-sure as to exactly when the D.factory began their change-over from the plain-type to the newer-type -(with the added ribbing). _ I do have good reason to believe that that change-over occurred about the same point in time as when the wheel-covers with the fake air-scoops replaced the older plain-type wheel-covers, because I believe I recall noticing that both of those change-overs must have occurred about the same time as when the 5-speed Duke-models came-out (about late-1963), since all the 4-speed & 5-speed DUKEs I've ever had my hands-on, (as I recall), reflected those (suspected) combinations of parts.
(* A fact which should be known is that most-all of such illustrations & pictures in mag.ads etc., for pre-66 5-speed Duke-models, ACTUALLY depict the very-same picture used for PREVIOUS models-years [of the same model !].)
__ So anyhow, it would be nice if others of us with pre-66 5-speed Duke-models would confirm that their Duke's rear-wheel (with 7-finned hubs), indeed employs the newer-type sprocket-carrier (with the 6-ribs).
Dukaddy-DUKEs,
-Bob