You need a campagnolo cassette lockring tool to remove that campy cassette, like the Park Tool BBT5/FR11.
Shimano cassettes won’t fit on Campagnolo freehub body, unfortunately.
You can buy a freehub body for Shimano from Mavic to replace the Campagnolo freehub body though if you want to use a Shimano cassette with that Ksyrium rear wheel. I did that with an old Ksyrium SL rear wheel I owned and it’s an easy swap (the replacement part for my Ksyrium rear wheel was a Mavic FTS-L freehub body for Shimano cassettes).
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[https://www.parktool.com/en-us/product/freewheel-remover-bottom-bracket-tool-bbt-5-fr-11](https://www.parktool.com/en-us/product/freewheel-remover-bottom-bracket-tool-bbt-5-fr-11)
and no – campy splines are different, sorry
You need a campagnolo cassette lockring tool to remove that campy cassette, like the Park Tool BBT5/FR11.
Shimano cassettes won’t fit on Campagnolo freehub body, unfortunately.
You can buy a freehub body for Shimano from Mavic to replace the Campagnolo freehub body though if you want to use a Shimano cassette with that Ksyrium rear wheel. I did that with an old Ksyrium SL rear wheel I owned and it’s an easy swap (the replacement part for my Ksyrium rear wheel was a Mavic FTS-L freehub body for Shimano cassettes).