What tools do I need to remove a bike cassette?
The lockring is designed to hold the cogs of the cassette in place on the hub. In order to remove and replace your cassette, you need to unscrew this lockring. You’ll need three tools to do this: a chain whip, a cassette lockring remover and a large adjustable crescent wrench.
Can you change a cassette without a chain whip?
The premise is awesome; using just the lockring and a borrowed wrench from an auto parts store, you can remove a cassette in the field without a chain whip, which is prohibitively heavy to carry on tour.
What can I use instead of chain whip?
If you have a regular claw hammer and another length of chain, then you can create your own chain whip. Just drape the length of chain through the claw part of the hammer with the majority of chain going away from the handle of the hammer.