Go into the setting menu on the dash and you can do a new calibration for changes in gearing or tires etc.. Once you get it started, then ride at between 35 to 38 mph for a short distance and it will readjust the speedo for the new gearing etc. The older bikes like the 1198 and 1098 would not do this and if you changed to another tire etc. it would throw off the Traction Control and Speedo etc.
I believe it is approximately 450 to 500 extra rpm by going down one tooth on the front sprocket. *There is some real advantage in going down one tooth in the front (or up a couple in the rear) while riding on the street because it takes less throttle/ less clutch slipping to take off from a light etc. and you can use a taller gear on the highway. I never get out of 5th on the highway with the stock gearing unless I want to do over 90 mph! and that will get you busted quick here in the Austin area... This bike is geared for the EPA noise so it is pretty high in first so they can drive by at a lower rpm and pass the noise regulations and CARB etc. Pretty sad to see what the damn government is doing to the world in the name of so called "Climate Change" It is all total BS...
The government will do everything it can to tax your and rule over you with more and more regulations.. They never get enough..
Speedy