Shimano XT M8100 12-Speed Cassette 10-51T

Paired with the new Shimano MICROSPLINE freehub, you have an incredibly lightweight package that delivers industry leading performance. The high geared 10-speed cog gives you all the speed you need to sprint to the finish, and either a 51T or 45T low gear allows you to effortless ascend the steepest trails. The 51T cassette pairs with a single ring up front while the 45T cassette is compatible with a single or double chainring up front.