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This product is used for rear derailleur extension, apply mountain freewheel 11-40, 11-42, 11-46, or Shimano, SRAM, Sunrace, 40T, 42T, 46T Road flywheel.
Expand the flywheel speed change more smoothly.
At this time, you just need to add this product in the original bicycle real dial hook the converter, you can easily solve the troubles you encounter.
Aluminum alloy material, CNC workmanship, solid and firm, very durable.High quality Workmanship is very detailed, smooth burr-free, precise size.
Great accessory for cycling enthusiasts.
2 pcs Bike Rear Derailleur Converter 10/11 Speed Bicycle Rear Derailleur Hanger Cycling Bicycle Tail Hook Lengthener - B074FVHTHR