Not knowing any better, I went with Surly's recommended components which included a 30/42/52 crankset. I can already see that I might eventually need something more like your 24/36/48. When I decide to make the switch, is there any way to change the chainrings on my shimano 105 crank to 24/36/48, or am I looking at a complete change to a mountain crank which will mean a different derailer, chain, cassette,rear derailer,ect.? I currently have the Shimano LX HG70 11-32 cassette. Would this be compatible with a mountain crank?