Box One Prime 9 Speed Rear DerailleurBuilt for the rigours of mountain bike riding, this 9 speed rear mech offers smooth and precise operation on every off-road adventure. It takes the advantages of legacy 9 speed drivetrains but also adds the advancements of modern 1 by drivetrains. It features a fully adjustable Tri-Pack Clutch, Forged Construction as well as optimisation for an 11-50T cassette. This allows it to step up to the durability and performance of an unparalleled level that’s suited for the most demanding MTB terrain.FAQAre Box Prime 9 derailleurs compatible with Shimano “direct mount” hangers? No, Shimano direct mount hangers are proprietary and are not compatible with Box derailleurs.Is the Box One Prime 9 Derailleur compatible with other 9 speed components? No, traditional 9 speed systems use a Cable Pull that is not compatible with Prime 9.Are Box Prime 9 derailleurs compatible with drop bar (road) shifters? No, Box Prime 9 derailleurs are not currently compatible with drop bar shifters, but we do offer a clamp for our shifters to mount on some 31.8mm drop handle bars.How should I clean my Box One Prime 9 derailleur? We suggest removing the derailleur from the bike and using a soft bristle brush or rag with soapy water or a mild de-greaser. We do not recommend pressure washing, strong solvents or de-greasers as they could degrade the surface coating.Features: Material: Stainless Steel, Hardened Alloy Steel, Nylon Composite with hard Onyx finish Adjustable Tri-Pack Limited Slip Clutch Precision Sealed Bearing Pulleys Carbon-Nylon Composite Knuckle Pivot-Tech Cable Stay Durable 3D Forged Linkages Forged Inner and Outer Cage Prime 9 Technology Compatible with Standard Derailleur Hangers (Non Direct-Mount) Compatibility: Box One Prime 9 11-50T Cassette Black Box Two Prime 9 11-50T Cassette Black Box Three Prime 9 11-50T Cassette Black Box One Prime 9 Chain 126L DLC Black Box Two Prime 9 126 Link Chain Nickel Box Three Prime 9 126 Link Chain Polished Box One Prime 9 Shifter Black Box Two Prime 9 Shifter Black Box Three Prime 9 Shifter Black Weight: 290gBuy Box Components from Chain Reaction Cycles, the World’s Largest Online Bike Store.