Derailleur hanger extender. Like Goat Link or Race Link. Mech Range expander
Road Bike Bicycle Rear Derailleur Hanger Extension Extender MTB Bike Material: aluminum alloy 6061+7075 aluminum alloy screws Color: Black Bike Type: Road Biycles / Mountain Bikes Size: 43 x 21 x 12.6 mm Weight :about 12g Fittings: 1pc screw Package Includes:1 x Rear Derailleur Hanger,1 x Bolt
Features: Aluminum material with CNC finish, very sturdy and durable. Work on 8-speed 9-speed 10-speed and 11-speed 40T to 50T cassettes. Relieves spring tension on the rear derailleur for easy steep climbing. M10×1.0 threads, includes a mounting bolt. A chain link that is mounted between the bike's pin and gears.