CS-M7100-12 SLX - 12-Speed - HYPERGLIDE+ - MTB Cassette Sprocket With its BEAM SPIDER construction, the SLX M7100 12-speed cassette shaves weight while increasing SHIMANO's MTB gearing range another gear. Using SHIMANO's new MICRO SPLINE freehub body and HYPERGLIDE+ tooth profile, these 10-45 and 10-51T cassettes deliver advanced shifting performance. ~Advanced shifting performance provides the confidence to enjoy any trail Pedal continuously while shifting HYPERGLIDE+ Lighter and stiffer cassette sprocket construction reduces inertia and increases acceleration BEAM SPIDER ~Lighter drivetrain set up 10T lowest sprocket realized by new FREEHUB body construction MICRO SPLINE ~Wide range and close step 12-speed drivetrain PRODUCT SPECIFICATIONS MODEL NO: CS-M7100-12 SERIES: SLX M7100 Series Average weight: 513 (10-45T), 534 (10-51T) Combination: 10-12-14-16-18-21-24-28-32-36-40-45T | 10-12-14-16-18-21-24-28-33-39-45-51T Combination name(Group name): 10-45T, 10-51T Compatible chain: HG 12-speed Speeds: 12 Spider arm_QTY (pcs): 1 Type: HYPERGLIDE+