7
1.Adjust the screw on the shifting wire when it is hard
to switch the shifter.
2.Loose screw 1 slightly when the shifter can`t switch
to the 7th gear; on the contrary, if it can`t gear down
to the 1st level, loose screw 2 slightly and try again.
Loosen screw 1 and 2 to make the derailleur move
slightly away from the rim in case of the chain rubs
the tire.
4.Tighten the screw when the shifter can`t switch to
the highest gear.
Derailleur: