the ratchet ones are easy to replace, you can buy them separately, not sure about the others.
http://www.chainreactioncycles.com/au/en/s?q=mavic+ratchet&cat=direct
@pascalo started
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the ratchet ones are easy to replace, you can buy them separately, not sure about the others.
http://www.chainreactioncycles.com/au/en/s?q=mavic+ratchet&cat=direct