I have a 2007 Nightster, that does not like 5th gear unless I am going above 60mph. As a result, it very often feels like I am lugging the engine if I forget and shift into 5th at 50 or 55. Has anyone ever changed their primary gearing to the 883 of 57/34 from the 1200 57/38? If so, how do you get the speedo to be correct? The reason I'm thinking of the change is that I believe I would get a better launch, and be nicer to the motor when running 60 - 65. Thanks Jake PS. the bike has 5K miles on it so breaking it in now is most likely not an issue.