Current Projects chat and miscellany

I think only the WH-7800 range got the deep spline 10-speed-only aluminium cassette rotor, it was quickly replaced by the 7850 with the standard HG spline Ti rotor, which carried over to 7900. WH-9000s are for 11-speed but can take any other HG cassette (7/8/9/10-speed) with appropriate spacers to fill up the gap.

http://cdn.mos.bikeradar.com/images/bikes-and-gear/components/wheel-sets/1262693610010-1e4zedrw1x299-399-80.jpg
so with these i should be fine and dandy with a 9 speed cassette?