Depends on the model, but Campy sells several wheels with the option of Shimano specific freehubs. To complicate matters, depending on the year, some are 10 speed specific meaning you can only use a 10 speed Shimano cassette starting with 11 or 12 teeth so you can't use older 8/9 speed cassettes or SRAM cassettes with them. You have to check the tech specs for the particular model and year to sort it out.
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