Hey there, I have been wondering the same thing. I´ve only had my bike for 2months and not sure when I should shift. A few biker friends of mine told me to wind it way out and to shift when the white shifter light comes on. I typically shift mine around 6000rpm´s, and that still seems to late to me cause the bike will pop a pretty good wheelie in 1,2,and3rd gears. I never even have to get out of 2nd gear to ride around town or doing 70mph on interstate. Bike seems to be geared very low but it has 2 racing cams, racing air filter,Devil exhaust, any many other performance parts on it. Hopefully someone will answer our question.