Shimano CS-M9101-12 Cassette - 12-Speed 10-45t Black/Gray Micro Spline MFPN=RR21DM40TFLT12BLK The flexible and stretchy polymer

The flexible and stretchy polymer easily stretches to fit over your existing saddle adding comfort without the hassle of changing your seat

Compatibility iPhone XR Waterproof No Bike Mountable Yes Defined Color Black

Plugs into the Airstream headlight

Fits 10-50 tooth cassette range

Meet the Transfer SL Performance Elite Dropper Seatpost

Shimano CS-M9101-12 Cassette - 12-Speed 10-45t Black/Gray Micro Spline MFPN=RR21DM40TFLT12BLK The flexible and stretchy polymerShimano CS M9101 12 Cassette 12 Speed 10 45t Black Gray Micro Spline. 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 smoother pedaling for