I'm thinking about gearing my bike for slightly better acceleration since i never hit top end speeds anyway. That would be +1 or 2 in the rear or -1 or something in the front? Is it easier to change gearing on the rear or front? Also, is there a difference in doing the two? And at which point would i have the replace the chain? I do mainly commuting, so ridability afterwards is important, might it be a neighborhood or the freeways. Any input is appreciated. Also, i'm riding an k2 if that information is needed.