Join Date: Nov 2003
Location: Lafayette, CA
Bikes: Time RXRS, Specialized Stumpjumper FSR
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If you are planning to use the triple crankarms with the double's chainrings, no problem. The other way around (double crankarms) you can install the two larger chainrings of the triple set but won't have any threads for the small ring.
Your double probably came with a 53-39 combo while the triple came with a 52-42-30. The triple crankset may become a 53-39-30, 52-39-30, or a 53-42-30. The double crankset may become a 53-42, a 52-39 or a 52-42.
I use a 53-42-30 combo on my triple.