Box Three Prime 9 Speed Rear DerailleurThis Box Three rear mech simplifies the features found on the Prime 9 Box One and Two model’s, making for a fully-featured value for money rear derailleur. Including a Limited Slip Clutch, Sealed bearing pulleys and a solid construction, the Box Three rear mech is compatible with 11-46 and 11-50t derailleurs making it one of the most versatile derailleur offerings for Prime 9.FAQ:Are 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 Three 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 Three 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: Aluminium, Glass Fibre / Nylon Composite, Steel with matte finish Limited Slip Clutch Bearing Pulleys Nylon Composite Knuckle Direct Channel Cable Stay Die Cast Linkages Stamped 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 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 BlackWeight: 349gBuy Box Components from Chain Reaction Cycles, the World’s Largest Online Bike Store.