XTR CS-M9101-12 Cassette 12-Speed 10-51t size-27-5-x-2-40 polarized lenses and UV400 protection

polarized lenses and UV400 protection that blocks 100% of those harmful UVA and UVB rays

One end securely engages the 16 notches of the bottom bracket cups

Keep your hands warm and don't lose your grip

Customize Your Comfort: Use the cinch cord to tailor the firmness and support to your ideal comfort level

Bio-degradable glide wax is safe for the environment

XTR CS-M9101-12 Cassette 12-Speed 10-51t size-27-5-x-2-40 polarized lenses and UV400 protectionShimano XTR CS M9101 12 Cassette 12 Speed 10 51t Black Gray Micro Spline ICSM9101051 Shimano XTR CS M9100 cassette features better chain retention and ground clearance. This cassette is built with a strategic application of aluminum, titanium, and steel materials for an optimal blend of weight savings, rigidity, and durability. Compatible with Shimano Hyperglide+ chains Hyperglide+ technology offers better chain engagement, stronger retention, and