Shimano CS-M8100-12Deore XT 12Speed Cassette Sprocket Bike Electronics The Pulse Ox sensor gauges

The Pulse Ox sensor gauges your blood oxygen saturation during the day and as you sleep to show how well your body is absorbing oxygen

On top of the strength that comes standard in all of our ReZion™ styles

Self-engaging one-handed system shifts from high to low speed

•Naturally antimicrobial & machine washable

Shimano CS-M8100-12Deore XT 12Speed Cassette Sprocket Bike Electronics The Pulse Ox sensor gaugesSHIMANO DEORE XT 12 Speed HYPERGLIDE+ MTB Cassette Sprocket With its BEAM SPIDER construction, the new SHIMANO DEORE XT M8100 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. FEATURES Definitive shifting performance New shift ramp designs provide the fastest,