have new 2017 f 800 gsa, frt sprocket is 16 and rear is 42. I ride cross country and and RPM is 4500 at 75 mph would like to drop that down and run at 80 mph at around 4000 or just slightly less. I am think a 44 tooth rear gear would get me closer to what I need. Any help out there or suggestions, my first time messing with rear sprockets and charts are helpful but experience best teacher. thanks, TJM 112299
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