The Shimano SLX M7100/M7200 12-speed Upgrade Kit includes everything needed to enhance your drivetrain. The RD-M7100 Rear Derailleur ensures smooth, efficient shifting and supports cassettes up to 51 teeth. The all-new Deore-level M7200 cassette features Rider Tuned gear steps for optimal cadence control across diverse mountain bike terrain. Featuring RapidFire Plus technology, the shift lever enables rapid shifting, letting you downshift up to three gears with a single stroke. The M7100 chain also delivers dependable shifting performance. Details The SLX M7100 / Deore M7200 Mechanical Upgrade Kit Includes: Shimano Deore CS-M7200 Cassette Cassette Cogs: 10-51t: 10-12-14-16-18-21-24-28-33-39-45-51t Material: Aluminum, Steel Compatible Freehub: Shimano Microspline Shimano RD-M7100 Rear Derailleur Mechanical rear derailleur Cage Length: SGS/Long Max Low Sprocket: 51t Pulley size: 13t Shimano SL-M7100 Shift Lever Mount: 22.2mm clamp or I-Spec EV Max multiple shifts: 3 Shifter type: Rapidfire Plus Included Derailleur Cable: Optislick Shimano CN-M7100 Chain Number of links: 126 Quick link included (SM-CN910-12)