How do I take the cassette off the rear wheel?

To remove the cassette from the rear wheel, you will need a cassette removal tool and a wrench. First, remove the quick-release skewer or thru-axle from the wheel. Then, insert the cassette removal tool into the center of the cassette and use the wrench to turn it counterclockwise to loosen it. Once it is loose, you can slide the cassette off the freehub body.