I have a K2 with the 18-48 sprockets and an 18" rear tire. Most of my riding is on flat roads going at least 70 mph. My rpm at 70 is 4600. I doubt I should change to a 17-48 setup since it would probably knock down my gas mileage at 70 mph plus and increase my engine rpm while cruising. I use my bike primarily for cruising at 70 mph plus. What gearing should I go with guys?
Justin