How to change the cassette on a bike?

To change the cassette on a bike, you will need a chain whip tool and a cassette lockring tool. First, remove the rear wheel from the bike. Use the chain whip tool to hold the cassette in place while using the lockring tool to loosen and remove the lockring. Slide off the old cassette and replace it with the new one, making sure the teeth line up correctly. Tighten the lockring back in place and reattach the rear wheel to the bike.