Shimano XT/SLX/Deore 12spd Build Kit - OE Packaged Three Tiers, One Drivetrain This OE-packaged build kit blends three tiers of Shimano's 12-speed MTB lineup into one drivetrain - a Deore crankset and shifter, an SLX rear derailleur and bottom bracket, and an XT cassette for a wider gear range than a straight SLX build would offer. Running 1x12 on a 10-51t cassette, it uses Shimano's Micro Spline driver, which is not compatible with older HG-driver hubs, so confirm your hub's driver standard before ordering. The kit includes the crankset, shifter, cassette, bottom bracket, rear derailleur, and chain, along with bottom bracket/spindle spacers and a derailleur cable; brakes and rotors are not included. Features1x12 mixed-tier Shimano drivetrain combines Deore, SLX, and XT components across the build XT CS-M8100-12 cassette, 10-51t Micro Spline driver required, not compatible with HG-driver hubs SLX RD-M7100-SGS rear derailleur clutch-equipped for chain retention and reduced slap on trail terrain Deore SL-M6100-IR shifter I-Spec EV mount for a clean, integrated cockpit SLX SM-BB52 threaded bottom bracket (BSA) included, no need to source separately SLX CN-M7100 chain 126 links, quick-link included Also includes: bottom bracket and spindle spacers, derailleur cable Brakes and rotors not included pair with your own hydraulic disc setup Specifications Intended Use Trail, All-Mountain Cassette XT CS-M8100-12 Cassette Crankset Shimano Deore FC-M7120-1Shifter Shimano Deore SL-M6100-IR, I-Spec EVRear Derailleur Shimano SLX RD-M7100-SGSChain Shimano SLX CN-M7100, 126 Links, Quick-Link Included Bottom Bracket Included (Shimano SLX SM-BB52, Threaded BSA, Silver)Extras Included Bottom bracket & spindle spacers, derailleur cable | Shimano | Xt/slx/deore 12Spd Groupset - Oe Packaged 170Mm Crank, 30T Chainring