I have a set of Mavic Crossmax wheels on the Eriksen; an XL on the front and an ST on the back. The rear Crossmax ST started dragging a little and started developing some play in the cassette. A little research pointed me to this MTBR thread and some great videos demonstrating the freehub service form RogueMechanic (Part 1, Part 2). Another useful resource (from the MTBR thread) are these Mavic reference guides.
I started off with the disassembly, and so far so good. All of the components were intact, didn’t look too dirty, and with the exception of the freehub, weren’t excessively worn. After a thorough cleaning things still looked good.
Fast forward a week and the arrival of a new freehub. Thanks to Competitive Cyclist I have a reasonably priced replacement freehub. The new freehub went on with out any difficulties and I was lucky enough to find this oil:
Mavic-branded mineral oil is very expensive, so you can save some cash if you can find this stuff. Anyway, the wheel is back together and the bearing free play is adjusted. Overall, the service was fairly simple and required no specialty tools aside from the hub wrench Mavic includes with the wheels and standard issue bike tools like a chain whip and lockring tool. Anyone who can install a cassette should be able to do this without too much difficulty.
During the downtime we had some snow and I had a nice winter ride on the singlespeed: