Got a follow up question: eyeballing the RSX crank against the present Exage road crankset, it looks like I will need to rmove the small ring mounting posts to clear the chainstay. Any reason not to take them off? Also I was comparing the RSX crank to an Exage R500? mountain crank and it looks like they have about the same Q factor. Besides weight, is there any functional difference between road and mountain cranks with the same Q factor and crank leangth?