Rear axle swap on Mavic hub Is it possible to change the rear axle from a 12x142 thru axle to a 9x135 qr on a Mavic Ksyrium wheel?
https://shop.mavic.com/en-gb/ksyrium-disc-rr0889.html#1028=3283

Compatibility
Rear axle: 12mm thru axle, convertible to Quick Release with optional adapters (not available in Germany)

This listing offers various adapters, including a QR option, which may fit your hub:
https://shop.mavic.com/en-gb/rear-axle-adapters-oc0672.html#1040=3808