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• Product Name :Direct Mount Rear Derailleur Hanger Brand : Greatin Material :Alloy 7075 T6 Color：Black Weight:12 Suit for: Spec-allized Disc Brake Version TARMAC SL8 TARMAC SL7 TARMAC SL6 VENGE PRO DISC AETHOS ROUBAIS 20 Years Later Road Bikes What are direct mount rear derailleur hangers? To perceive why direct mount rear derailleur hangers are needed, we first should explain (a) what is a direct mount rear derailleur, and (b) the “B2 link” (or “b-link”) that become originally used to attach the direct mount rear derailleur with a standard rear derailleur hanger before the appearance of direct mount derailleur hangers Direct Mount Rear Derailleur Shimano first introduced direct mount rear derailleurs with the discharge of their Shadow rear derailleur line in 2012 In the Shadow product line, the pivot point at the rear derailleur become moved further to the rear and the rear derailleur itself positioned extra directly below the rear cassette As a result, the Shadow rear derailleur has a lower profile than regular rear derailleurs, which obviously has benefits within the extra various terrain encountered with a mountain bike This geometry additionally offers different features compared to normal rear derailleurs: Creates a more potent linkage between the frame and rear derailleur, leading to extra exact shifting; Provides more space to remove and update the rear wheel, enabling faster and simpler rear wheel changes; Enables the frame to be designed such that the rear dropout can accommodate thru-axle wheel mount; Note:Thru-axle wheel mounts are desirable for wheels with disc brakes because the disc brake locations extra off-center power on the rear axle than do rim brakes

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