Move the shifter to gear number 2. Check if the two yellow lines are aligned well. * Rotate the shifter cable adjuster to align them. Select gear 4 and then change back to gear 2. Rotate the pedal cranks a full turn and then check again to ensure that the two indicator marks are still aligned. Repeat the above steps until the yellow indicators are aligned. * Please note that the two lines are not 100% accurate on all hubs. Some do shift better when the lines are slightly out of position and it takes a bit of experimenting to find the optimal position.