How to Replace a Cassette on a Mountain Bike: A Step-by-Step Guide
To replace a cassette on a mountain bike, first remove the rear wheel. Locate the lockring on the cassette and use a chain whip tool to prevent the cassette from turning. Use a cassette removal tool with a wrench to turn the lockring counterclockwise to remove it. Remove the old cassette and place the new one in its place. Use the lockring tool and chain whip to tighten the lockring back onto the cassette. Put the rear wheel back onto the bike and you’re done.