Unfortunately you missed out on the group buy. It was 68 shipped to my door and now I believe that they are back to the 80+ range. As for making the sprocket change, it won't be a problem, just get an accurate reading of your speed. The best way to do that is either with a GPS or riding along next to a car.01cbrf4i said:I came home tonight to research a fix for this. I'm wanting to change the sprocket from a 46 to a 55 probably and i dont want the mph and ODO higher than they should be. How much did it cost ya to ur door?