Originally Posted by
ruirui
but the main question remains is, would i be able to use this SRAM with all of my other ultegra group?
please help.. thanks.
Yes, SRAM and Shimano cassettes are interchangeable. I've been running SRAM 9 and 10-spd cassettes with both Shimano XT and Ultegra derailleurs for over 10 years. In fact, I prefer SRAM cassettes over Shimano.
But as the others state, make sure the derailleur has the capacity needed for the crank and cassette.