Shimano XTR CS-M9100 12 Speed 10-51T Cassette

The Shimano XTR groupset is their top-end mountain bike groupset. When it comes to 12-speed shifting, few things are more important than a reliable cassette. This cassette allows you to pedal consistently and continuously while simultaneously shifting. The cogs are narrower with the same spacing and overall width to assure that you can still use your current frame with this setup. This cassette aims to balance low weight with durability and features aluminum outer cogs, titanium mid cogs, and steel inner cogs. It is only compatible with the Shimano Microspline freehub but this will get you some of the most seamless shifting performance in the world.