Black Rear Fork (Swing Arm) Assembly 

Rear fork body/aluminum forging/welding
Matte black finished rear fork, matching 121000.01045521 frame
Hexagon flange locking nut/M12 * 1.25/blue white zinc
Chain buffer rubber sleeve/TPU/black
Spacer (rear fork)
Oil seal/
Thrust cylindrical roller bearing
Spacer sleeve (rear fork bearing)
NK17/20 needle roller bearing
Spacer sleeve (in the rear fork shaft)Blue White Zinc