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Ericm979 is correct. The Dura-Ace 7800 hub has deeper splines, because the body is aluminum and the taller splines help hold the cogs better. Previously, the 7700 hubs were made of steel, and they would become notched from the drive force on each cog. After the 7800 series, they went to titanium, and back to short splines again, making them backwards compatible again to 8,9 and 10 speed.
 

· 'brifter' is f'ing stupid
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Ericm979 is correct. The Dura-Ace 7800 hub has deeper splines, because the body is aluminum and the taller splines help hold the cogs better. Previously, the 7700 hubs were made of steel, and they would become notched from the drive force on each cog. After the 7800 series, they went to titanium, and back to short splines again, making them backwards compatible again to 8,9 and 10 speed.
Good thing you came to the rescue...12 YEARS after the OP posted.
 
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