The standard gearing is 13t front 37 rear.... As far as I can gather, you canĀ“t get a smaller rear sprocket, but you can get a 14t front. I have done this on my 2008 CBF and it brings the rpm down to around 6450 at 100kph and 7100 at 110... I am about to fit a 130/80 rear tyre instead of the 130/70 and that should bring the revs down again to around 6250 at 100kph and 6800 at 110... I use my bike for some highway travel and would like to tour on it... I have added a puig screen and it has a ventura rack ... I feel my top speed is lower due to the taller gearing, but it does make for more relaxed cruising...