How to change your mountain bike cassette: A step-by-step guide
To change a mountain bike cassette, first remove the rear wheel and use a chain whip tool to hold the cassette in place. Use a cassette removal tool to loosen and remove the lockring from the cassette. Gently slide the cassette off the freehub body, being careful not to drop any of the spacers or sprockets. Install the new cassette in reverse order, making sure to line up the spacers and sprockets correctly and tighten the lockring securely. Reinstall the rear wheel and test ride to ensure proper shifting.