Clark W. Griswold
Join Date: Mar 2014
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What is wrong with the current crank? You could replace but it depends on the bottom bracket needed so that might also need replacement and then some adjustment of the gear and I would probably also replace chain and cassette.
If it is the Callas from South Korea, I wouldn't put much time or especially money towards it, if it is something nicer than you could but first figure out what is wrong with the current cranks. A two teeth difference for two chainrings on a triple isn't a huge enough need to swap over at least not for me.