With great performance on the rear derailleur extension, also can be an excellent gift for your cycling friends. 【Easy to Use】 Rear derailleur hanger extension fit for a wide range bikes style cassette., Increased by 41mm, it can be used when the rear flywheel is changed to 36T, 40T, 42T, 44T, 46T, 50T, 52T, 56T.
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