Levers- double, triple or both?

rjh299
rjh299 Posts: 721
edited May 2009 in Road buying advice
Hi, i've found some Ultegra STI shifters they say they were from a bike with a double set up. When i searched for these in shops they say double and triple compatible. How are you supposed to know if they will work on a triple?
They are the Shimano Ultegra 6500 STI shifters.
Would these work on a triple or exclusively for double chainsets?
Thanks for help

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