I know that the 3 Shimano AX groupsets were short live groupsets in that they were produced for only a few years in the early 1980s. Regarding the Dura Ace AX bottom bracket. Did Shimano ever make a sealed cartridge type bottom bracket for the Dura Ace AX cranks? All the ads in my 1981 and 1982 magazines and catalogues sho a standard cup and cone bottom bracket. someone had posted an image of a Dura ACE AX crankset on a sealed cartridge bottom bracket. they claim it's original to the bicycle but i never saw one like it in the 1980s. So, is this original or were all Deura Ace AX bottom brackets cup and cone ones?
Thanks and cheers