Just wanted to follow and confirm that 12-speed cassettes will work with 9-speed hubs generally. I say generally because I had a set of 9-speed Record Titanium hubs and while the 12-speed cassette fit, you will need the cassette lock ring made specifically for that hub with a 26.0mm diameter. The non-Titanium 9-speed lock ring will not work, nor will any from 10, 11, or 12 speed cassettes which are 27.0mm. There are two versions, one for an 11-tooth cassette ring and another for 12/13 tooth.