SunRace Cassette 12-speed 11-50 (HG spline)A very special 12 speed cassette which provides a great way to upgrade to 12 speed without having to swap out your hub or freehub body. These will work on a regular old Hyperglide freehub body, which is the most commonly found, and usually used for anywhere between 8 and 11 speed drivetrains. You will still need a 12 speed compatible derailleur and shifter for it to play nicely. It won't work with Sram XD drivers. It must be Hyperglide!