I can catergorically state that 10 speed cassettes work fine on these hubs (I have a 10 speed cassette on mine right now), whether the hybrid ones with the threaded end on the freehub body that accept the uniglide cassette or the Hyperglide only variant which might be yours going by the date as that is the year 9 speed came into production.
Some of the earlier 10 speed cassettes were redesigned to fit on the new freehub body shimano brought out but as this made those wheels incompatible to 8 & 9 speed cassettes Shimano dropped it not that long afterwards.
I have a brand new 10 speed 11-28 Ultegra cassette for sale if you're interested.
I can catergorically state that 10 speed cassettes work fine on these hubs (I have a 10 speed cassette on mine right now), whether the hybrid ones with the threaded end on the freehub body that accept the uniglide cassette or the Hyperglide only variant which might be yours going by the date as that is the year 9 speed came into production.
Some of the earlier 10 speed cassettes were redesigned to fit on the new freehub body shimano brought out but as this made those wheels incompatible to 8 & 9 speed cassettes Shimano dropped it not that long afterwards.
I have a brand new 10 speed 11-28 Ultegra cassette for sale if you're interested.