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The Box Two Prime 9 Rear Derailleur is very similar to the Box One version however, to be more wallet friendly, it offers a non adjustable Tri-Pack™ Clutch, bushing pulleys and some muted finishes. Box Two rear derailleurs are still optimized for 11-50t cassettes and offer durability and performance for the most demanding terrain, just at lower price!
Our Most Durable Derailleur For Aggressive Terrain Tri-Pack™ Limited Slip Clutch Sealed Bushings Pulleys Pivot-Tech™ Cable Stay
Process/Material · B-Knuckle: 3D Forged / Aluminum · P-Knuckle: Injection Molded / Glass-Nylon Composite · Linkages: 3D Forged / Aluminum · Cage: Forged / Aluminum Finish: Matte Hard Onyx Speeds: 9 Compatibility · Platform · Ebike · Non-Ebike · Shifter · Box Two Prime 9 · Box Three Prime 9 · Derailleur Hanger: Non-Direct Mount Weight: 290g/10.2oz