Top Gear 1 Y11F01000 Lock Ring for 12T, 13T Top Gear Y1ZJ1140E Sprocket Wheel 11T (Built in spacer type) for bf/an-Group 2 Y11F1149E Sprocket Wheel 11T (Built in spacer type) for aw/ca-Group Y11F1219E Sprocket Wheel 12T (Built in spacer type) for S/U-Group 3 Y11F1223E ...