This is the Mavic freehub body that is needed for Mavic road wheels for Shimano and SRAM Road 9 and 10 speed cassettes.
This freehub body also fits the following MTB wheels: Crosstrail and Crossride....Not to be too confusing!
Mavic Part# M40592
UPDATED FOR 2013: Mavic "updated" the M40592 to part #: 308 711 01. This FHB includes a spacer to be used with 9mm axles and a shouldered spacer/reducer for use with 8mm axles.