Originally Posted by
HillRider
AFAIK, ALL Shimano 10-speed cassettes will fit on the Dura Ace 7800 hub.
The problem is the 7800 hub will not accept 8 or 9-speed cassettes while the Ultegra and 105 "10-speed (6600 and 5600 series) hubs will take 8 or 9-speed cassettes along with the 10-speed cassettes.
A tiny precision, according to Sheldon Brown.
The Ultegra
hubs will take 8, 9 or 10 speed cassettes, but Ultegra
wheels only take 10-speed cassettes.