this makes the bike a little less lazy.
i'm running 15/47 but going back to 15/46 setup next time.
15/47 is perfect if you only occasionally go on highways.
it sits perfectly happy at 105-110km/h (gps) at about 4500-4700rpm.
just try it out, 1 tooth more in the back, you'll soon notice it's much more suited to this bike.