I ride a TREK 2.3 bike right now. I am looking to buy another bike soon and this is my question. I have been rolling along rather well with my triple crankset. My TREK has a 50/39/30 on her now with a 11-28 10 speed rear cassette. The bikes I am looking at now....TREK and GIANT in an up-graded model offer a 50/34 crank and a 11-28 cassette on the ( TREK) and 39/53 crank and a 12x25 10 speed on the (GIANT). I find this very complicated as I can't say I really understand the whole crank/cassette ratio thing. Any help would be greatly appreciated. From my reading up on this subjet, looks like the compact is the way to go, I think.