Join Date: Mar 2010
Location: Montreal, Quebec
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Per Shimano specifications:
Ultegra RD: min sprocket 11T, max sprocket 28T, total capacity 33T (shorter cage) or 39T (longer cage)
XT RD: min sprocket 11T, max sprocket 36T, total capacity 35T (shorter cage) or 43T (longer cage)
If you want triple chaincranks, you would need the longer cage version of Ultegra. Maybe the same applies for XT, depending on your chainrings.
However, I think many people run Ultegra 6700 RD with SRAM 11-32 cassettes. For instance, that is the OEM specification on Co-motion Speedster and on our 2010 Primera. We didn't have any problems with that set-up and are entirely satified with shifting performance.
Last edited by PeFSQ; 06-27-11 at 06:43 AM.