Mavic adapters to transform the front hub from a 15 x 100 mm thru axis to 9 mm QR quick release. Quick release included.PP15 adapter (15 x 100 mm) .QR 9 mm (9 x 100 mm)Compatible with: MTB wheels from 2009Compatible with: Ksyrium Pro Disc 2015Not compatible with: Crossmax ST/SX/SLR from 2012.