Can I make my Cross-check into a triple?
Yes, but you'll need to buy some stuff.
The crankset that comes stock on our complete bike will accommodate a 74mm bolt circle granny ring. You'll need a 74mm BCD chainring, some bolts and spacers for it, and a longer bottom bracket (think 118ish) and a triple front derailleur because we've spec'd a double on it for 2013 .