The sprockets are commonly sold as a set, called a " cassette". There is no need to remove the ratchet mechanism. With a Freehub, on the other hand, once the sprockets are removed, the right hub flange is accessible for replacement of a broken spoke. Removing a freewheel is a chore, because pedaling tightens it onto the hub threads. When you wear out the sprockets on a Freehub, you replace the sprockets only, not the ratchet mechanism (which typically lasts much longer than the sprockets). The Freehub incorporates the ratchet mechanism into the hub body (although the ratchet mechanism is still replaceable).
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