I bought a pair of wheels that are dura ace hubs laced to mavic mach 2 ceramic rims.The rear hub in the picture has threads on the end of it so I'm thinking it is either a 6 or 7 speed hub. I don't suppose I can put a 8 or 9 speed casett on the hub can I? My road bikes are fairly new so they will easily take a 8-9 speed hub.