i think the biggest trouble with todays riders and track conditions is the type of engines being used today. All rev no torque ( light flywheels ultra/ short stroke / no pulling power/ all top end) tracks with blue line corners ( concrete slick) maybe think a change of gear ratio when the track gets cut up and patchy . I can remember when team managers used to advise riders of the best gear for conditions and were usualy right . can also remember changing sprockets five times during a meeting